Answer:
simple:
Explanation:
When the cell increases in size, the volume increases faster than the surface area, because volume is cubed where surface area is squared. When there is more volume and less surface area, diffusion takes longer and is less effective.
What is the difference between an embryo and a foetus
Answer:
An embryo is the early stage of human growth in which the vital body structures of organs are developed. In the 11th week of pregnancy, which is the 9th week of development after egg fertilization, an embryo is considered a fetus.
Explanation:
Answer:
An embryo is the early stage of human development in which organs are critical body structures are formed. An embryo is termed a fetus beginning in the 11th week of pregnancy, which is the 9th week of development after fertilization of the egg.
Explanation:
SOMEONEEEEE HELPPPP MEEEEEEEE
Answer:
The answer is A
Explanation:
Answer:
A
Explanation:
Under which of the following conditions would . lac operon produce the greatest amount of B-galactosidase? The least? Explain your reasoning Lactose present Ycs Glucose present Condition Condition Condition Condition Yes Yes No Ycs and 4 A mutant strain of E coli produccs f-galactosidase in both the presence absence= of lactose Whcre in the operon might the mulation in this strain be located? Examine Figure 16.7. What would be the effect of a drug that altered the structure of allolactose so that unable to bind t0 the regulator protein?
Under the condition of lactose present and Ycs, the lac operon would produce the greatest amount of β-galactosidase, while under the condition of glucose present, it would produce the least. This is because the presence of lactose and low glucose concentration stimulates the production of β-galactosidase.
β-galactosidase is essential for the breakdown of lactose into glucose and galactose. Hence, when lactose is present, it acts as an inducer by binding to the lac repressor protein, causing it to change its shape and release the DNA, which in turn initiates transcription of the genes encoding β-galactosidase. On the other hand, when glucose is present, it inhibits the synthesis of cyclic AMP, which is required for transcriptional activation of the lac operon, resulting in reduced production of β-galactosidase.
The mutation in the E.coli strain that produces β-galactosidase in both the presence and absence of lactose may be located at the promoter or the operator site of the operon. The promoter region is where RNA polymerase binds to initiate transcription, while the operator region is where the repressor protein binds to prevent transcription. Hence, the mutation could result in increased affinity of RNA polymerase for the promoter, allowing it to bypass the need for the inducer to initiate transcription. Alternatively, the mutation could decrease the affinity of the repressor protein for the operator, rendering it ineffective in blocking transcription even in the absence of lactose.
A drug that altered the structure of allolactose so that it is unable to bind to the regulator protein would result in the repression of the lac operon, even in the presence of lactose. Allolactose is the inducer that binds to the lac repressor protein to inactivate it, allowing transcription of the β-galactosidase gene. If the inducer is unable to bind to the repressor protein, it will remain bound to the operator, thereby preventing RNA polymerase from initiating transcription. Hence, the drug would mimic the absence of lactose, causing the lac operon to be repressed.
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how dose natural selection led to increases and decreases of specific traints in population over times
Natural selection leads to increases and decreases of specific traits in population over time by acting on the variation present in a population.
Natural selection is a process by which certain traits are selected for or against based on their survival and reproductive success in a given environment. Over time, this leads to the gradual evolution of a population as beneficial traits are passed down from generation to generation while less beneficial traits are eliminated. For example, if a certain population of birds has different beak sizes and shapes, those with beaks that are better adapted for a particular food source will have a higher chance of surviving and reproducing than those with less well-adapted beaks. Over time, the frequency of the well-adapted trait will increase in the population, leading to an overall increase in the trait.
Conversely, traits that are not well-adapted will decrease in frequency and may eventually disappear from the population altogether.As natural selection acts on the variation present in a population, new traits can arise through mutation, genetic recombination, or other mechanisms. If these new traits are well-adapted to the environment, they can increase in frequency and eventually become fixed in the population. Conversely, if they are not well-adapted, they will be selected against and may disappear from the population over time.
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There are several mechanisms through which reproductive isolation occurs. Which situation is an example of behavioral isolation?
A.
Mules, the offspring of a male donkey and a female horse, are unable to reproduce because they are sterile.
B.
Males of different, closely related species of fireflies signal for mates by flashing different light sequences.
C.
The reproductive organs of snails only properly align when the male and female belong to the same species.
D.
Red and purple sea urchins cannot reproduce with one another because the sperm and egg cannot fuse.
Answer: B. Males of different, closely related species of fireflies signal for mates by flashing different light sequences.
Reproductive isolation refers to the inability of the members of a species to breed with members of other species. Behavioral isolation is a type of reproductive isolation, in which mating between the members of the species is facilitated by their behavior. It helps members of the same species to identity their mates. It prevents mating between population of distinct species.
Males of different, closely related species of fireflies signal for mates by flashing different light sequences is an example of behavioral isolation because flashing of light by fireflies is the behavioral characteristic which shows their desire for mating. The mates identify the light signals flashed by their partner belonging to the same species.
Answer:
B. Males of different, closely related species of fireflies signal for mates by flashing different light sequences.
Hope this helps!
Explanation:
specify the reagent you would use in each step of the following synthesis: oh
The reagent you would use in each step of the synthesis is alcohol.
In organic chemistry, synthesis is the formation of chemical compounds by putting together simpler compounds or molecules. Synthesis can be used for a variety of purposes, including drug development. Organic synthesis involves a series of reactions that must be carried out in a specific order to create the desired compound. The reagents used in each step are critical to the success of the reaction. In the given reaction scheme, the desired product is an alcohol.
In the first step, an alkyl halide is treated with sodium hydride (NaH), a strong base that can remove the halide to generate a carbanion that can react with the carbonyl group in the next step. The resulting alkoxide intermediate is then reacted with an acid chloride to form an ester. The final step involves the reduction of the ester to an alcohol using lithium aluminum hydride (LiAlH₄), which can selectively reduce carbonyl groups without affecting other functional groups. Therefore, NaH is used in the first step, followed by an acid chloride, and finally LiAlH4 in the last step to synthesize the desired alcohol.
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What is the purpose of crop rotation?
A) To have a variety of plants for harvest
B) To improve soil color
C) To improve soil fertility and structure
D) To increase biodiversity
E) To loosen the soil for burrowing animals
Please select the best answer from the choices provided
A
B
Answer:
C) To improve soil fertility and structure
Explanation:
Crop rotation, the practice of planting different crops on the same land, improves soil health and boosts nutrients within the soil.
component of a phospholipid?
Answer:
Phosphate group headTwo fatty acid tailsExplanation:
A phospholipid is made up of a phosphate group head and two fatty acid tails. They are connected by a molecule of glycerol.
To form cell membranes, phospholipids line up with their hydrophilic (water loving) heads on the outside of the cell and their hydrophobic (water hating) tails inside.
A second layer of phospholipids forms with the heads facing inside the cell and tails facing away. This forms a double layer - with the phosphate group heads on the outside, and fatty acid tails on the inside. This double layer, called a lipid bilayer, forms the cell membrane.
If the half-life of carbon 14 is about 5730 years, then a fossil that has one-sixteenth the normal production of carbon-14 to carbon-12 should be about how many years old?
A fossil that has one-sixteenth the normal production of carbon-14 to carbon-12 is most likely very old. This is because carbon-14 has a relatively short half-life of 5730 years, meaning that after this amount of time, half of the amount of carbon-14 in an organism or object would have already decayed.
Since the fossil being discussed has one-sixteenth of the normal production of carbon-14 to carbon-12, this would suggest the fossil is at least 8 times the half-life, or 45,840 years old. Carbon-14 is necessary to measure the age of an object, and due to the fact that this fossil has only one-sixteenth of the normal carbon-14, it can be deduced that it is very old.
It is also possible that the fossil is much older than this calculation, but because of the short half-life of carbon-14, any other amounts which may have been present before the 45,840 year mark has decayed away. In conclusion, a fossil that has one-sixteenth the normal production of carbon-14 to carbon-12 is estimated to be 45,840 years old or older.
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6. Provide several pro's for GMO's and explain why they are pro's.
GMOs or genetically modified organisms are organisms where their genes were modified in some ways. Their genes were altered in order to increase the quality of food they produce. They are considered as extra healthy, extra-fast-growing, and extra resistant to pests and weather. They were designed to be less sensitive to insects and pests. Because of these gene characteristics, they require less pesticides. They have the ability to kill many pests and insects thereby aiding to conserve then from damage. They can be produce using fewer land, water, and pesticides making them cheaper. These savings in their production let the farmers able to provide cheaper price for their crops. They also contain extra vitamins and minerals.
Answer:More nutritious food.
Tastier food.
Disease- and drought-resistant plants that require fewer environmental resources (such as water and fertilizer)
Less use of pesticides.
Increased supply of food with reduced cost and longer shelf life.
Faster growing plants and animals.
Explanation:d
which two statements best describe fertilization and meiosis in the life cycle of plants
The two statements which best describe fertilization and meiosis in the life cycle of plants is option A and it includes the following:
I. These processes are part of the life cycle.
III. Fertilization produces a zygote, and meiosis produces haploid spores.
What is Fertilization?This is referred to as the process in which gametes fuse together to form a new organism while meiosis on the other hand is referred to as a type of cell division which involves the parent cell giving rise to four unique daughter cell.
Both processes mentioned above are part of the life cycle while the difference between them is that fertilization produces a zygote, and meiosis produces haploid spores which is therefore the reason why option A was chosen as the correct choice.
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The options are:
I. These processes are part of the life cycle.
II. These processes produce gametophytes.
III. Fertilization produces a zygote, and meiosis produces haploid spores.
IV. Fertilization is used only by seedless plants; meiosis is used only by seed plants.
A.I and III
B.I and IV
C.II and III
D.II and IV
Write a short paragraph that explains the central idea of the article. Use at least two details from the article to support your response.
Dozens of earthquakes hit Hawaii as the world's largest volcano erupts
On November 27, Mauna Loa erupted for the first time in nearly 40 years. Located in Hawaii, Mauna Loa is the world's largest active volcano. Volcanoes are openings or vents where lava, small rocks, and steam erupt onto the Earth's surface. Melted rock that comes up from inside the Earth and out of a volcano is lava. The Mauna Loa eruption occurred at the Moku'āweoweo summit caldera. This is a large sunken basin at the summit — or highest point — of the volcano.
Following the eruption, dozens of earthquakes swarmed the region — one of them a magnitude 4.2 quake. Magnitude is a number that characterizes the relative size of an earthquake from 1 to 9.
Remain Vigilant
Officials issued an ashfall advisory for Hawaii's Big Island and asked residents to remain vigilant. So far the eruption's lava flows pose no risk to people living downhill from the eruption, according to Hawaii's Tourism Agency.
Map showing lava flow of Mauna Loa from the years 1843 to 1984.
Image 1. The volcano's last eruption was in 1984, when it sent a lava flow close to the city of Hilo.
"At this time, lava flows are contained within the summit area and are not threatening downslope communities," said officials from the U.S. Geological Survey (USGS). The USGS is a government agency that collects information to help monitor natural hazards such as earthquakes. They warned, however, that the location and advance of lava flows can change rapidly.
The USGS's Hawaiian Volcano Observatory noted that it is set to perform flights to assess the eruption. They warned that "winds may carry volcanic gas and possibly fine ash and Pele's hair downwind." Pele's hair are thin strands of volcanic glass formed from cooling lava. The glass is sometimes carried into the air by strong winds and is sharp enough to tear skin and eyes.
Monitoring The Volcano
Mauna Loa takes up more than half of Hawaii's Big Island. It rises 13,679 feet (4,169 meters) above the Pacific Ocean, according to the USGS. The volcano is fairly active, having erupted 33 times since its first well-documented eruption in 1843. Its last eruption was in 1984 when it sent a lava flow close to the city of Hilo. After that, Mauna Loa entered its longest dormant period in recorded history. Periods of time when the volcano is not erupting, but could in the future, are volcanic dormant periods.
Scientists tracked an uptick in earthquake frequency beginning in June with five to 10 earthquakes a day. By September, the warning signs of an eruption increased. The number of earthquakes grew to around 40 a day in October.
The central idea that the text has is that it tells us of the fact that the scientists were talking about the eruption as a way of sending out warning to the people.
The parts that agree with this are: By September, the warning signs of an eruption increased. Officials issued an ashfall advisory for Hawaii's Big Island and asked residents to remain vigilant
What is the central idea of a passage?The most significant thought that the author wishes to convey to the reader is the key theme of a passage or story. It is possible to state the main notion immediately. The main idea is stated by the author.
The key thought or concept that the author wishes to convey to the readers about the subject is the main idea of a paragraph.
The main premise of the text is that it informs us of the fact that experts were discussing the eruption as a means of alerting the public.
The following passages support this: By September, there were more eruption warning indicators.
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how may earths would fit inside the sun?
Answer:
1.3 million Earths
Explanation:
Describe the characteristics of archaebacteria
Answer:
The common characteristics of Archaebacteria known to date are these: (1) the presence of characteristic tRNAs and ribosomal RNAs; (2) the absence of peptidoglycan cell walls, with in many cases, replacement by a largely proteinaceous coat; (3) the occurrence of ether linked lipids built from phytanyl chains and (4)
Explanation:
hope it will help you
Your family prepared an emergency plan in case of a natural disaster. Look at the list below and then select one additional item that should be included to better prepare your family.
A list of 15 items that should be in the emergency kit
The safest place in the house
A safe place for the family pet
A safe place in the neighborhood
A wallet card for each family member
A) A list of friends for each family member
B) A map of the house
C) An enlarged picture of each family member
D) Two emergency contacts
Answer: A safe place in the neighborhood seems the most reasonable or D
Explanation:
A map of the house wouldn't make sense because im pretty sure they would know around there house. An enlarges picture of each family member would also not make sense because it is just not helpful at all. A wallet card for each family wouldn't help them in there situation. A safe place for the family pet would help the pet but not everyone in the house so no. A list of friends for each family member would really be useful.
Answer:
D
Explanation:
It sounds way more reasonable then any of these questions.
Which is NOT a characteristic of the DNA double helix?The two strands are arranged in opposite directions.One nucleotide is 0.34nm in length.The two strands are held together by covalent bonds between bases.Each turn of the helix consists of 10 base pairs.The double helix is 2nm in width.
The statement that is NOT a characteristic of the DNA double helix is: "The two strands are held together by covalent bonds between bases" option C.
The two strands of DNA are held together by hydrogen bonds between complementary base pairs. Specifically, adenine (A) always pairs with thymine (T), and guanine (G) always pairs with cytosine (C). The hydrogen bonds form between the nitrogenous bases of the two strands, and these bonds are relatively weak compared to covalent bonds.
Covalent bonds, on the other hand, involve the sharing of electrons between atoms and are much stronger than hydrogen bonds. Covalent bonds can be found within each individual strand of DNA, such as the covalent bonds between the sugar and phosphate groups that form the backbone of the DNA molecule.
Therefore, option C ("The two strands are held together by covalent bonds between bases") is not a characteristic of the DNA double helix.
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Can someone help me?
Answer: C. flpid
Explanation:
Based on this information, what is the highest magnification power that Stella's microscope can achieve?
Answer:
400 x
Explanation:
The highest magnification power of Stella's microscope is 400 x. magnification refers to the enlargement of size of an object. Due to this magnification, parts of the identified object such as cell can be seen clearly. 400 X means that the cell size is maximize up to 400 times as compared to its original size. Different microscope has different magnification power. The highest magnification power of light microscope is 1500x while the highest magnification power of electron microscope is 10,000,000x.
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Which best describes a scientific theory?
Answer: An explanation that is supported by many different experiments
Explanation:
Some viruses can be crystallized and their structures analyzed. One such virus is yellow mottle virus, which infects beans. This virus has a single-stranded RNA genome containing about 6,300 nucleotides. Its capsid is 25-30 nm in diameter and contains 180 identical capsomeres. If the yellow mottle virus begins its infection of a cell by using its genome as mRNA, what would you expect to be able to measure when analyzing the reproduction of this virus?
Answer:
translation rate
Explanation:
Translation rate would be the thing measured in this scenario.
which of the following is NOT a way that carbon gets back into the air? 1. Burning of fossil fuels. 2. burning of plants and trees. 3. cells in living things give off carbon as they work. 4. crushing of rocks
Answer:
Crushing of rocks
Explanation:
It's right.
Which is the end result of cytokinesis from a cell undergoing mitosis?
a. one cell that has two identical copies of DNA
b. one cell that has two different copies of DNA
c. two cells that have two identical copies of DNA
d. two cells that have two different copies of DNA
Answer: C two cells that have two identical copies of DNA
Explanation: Took the test!
Not an essential nutrient because it can be synthesized by gut bacteria___
An antioxidant that prevents the oxidation of LDL __
Unique in that it acts as a hormone in the body __
A carotenoid that acts as an antioxidant __
A deficiency may lead to night blindness__
Vitamin A is not an essential nutrient because it can be synthesized by gut bacteria from dietary sources such as beta-carotene.
It is also a carotenoid, a type of antioxidant that can help protect cells from damage caused by free radicals.
1. Vitamin K is not an essential nutrient because it can be synthesized by gut bacteria.
2. Vitamin E is an antioxidant that prevents the oxidation of LDL (low-density lipoprotein).
3. Vitamin D is unique in that it acts as a hormone in the body.
4. Lycopene is a carotenoid that acts as an antioxidant.
5. A deficiency in vitamin A may lead to night blindness.
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PLEASE HELP!! I WILL GIVE 5 STARS AND HEART!!!
Darwin's experiments are just one way to study phototropism. A student wants to investigate the effects of phototropism in bean plants. She places a light source directly above one plant, at a forty-five-degree angle to another, and at a ninety‐degree angle from the third.
a. What is her independent variable?
b. What is a hypothesis she might write for her experiment?
Answer:
The independent variable is what is being changed or altered in the experiment (light position), the dependant variable is what is altered or changed by the independent variable (plant).
Explanation:
Consider what is being changed in this experiment to investigate the effects? The plant itself is not changed by the experiment but the positioning of the light source is. That is your independent variable.
The Hypothesis she will write
Researchers come up with their hypothesis based on the information they already know. So to write your hypothesis think about what you already know about phototropism. What do you think will happen to the plant in relation to the positioning of the lamp? Will the plant not move? Will it bend or move to face the lamp?
What are the function of the ribosomes?
Answer:
Ribosomes have two main functions; decoding the message and the formation of peptide bonds.
Beginning with the first step on top, list the steps in order for the first part of assisting in a gynecologic exam.
Instructions
The steps involved in assisting in a gynecologic exam may vary depending on the specific circumstances and healthcare provider's preferences.
However, here is a general outline of the steps involved, starting from the first step at the top:
1. Preparing the examination room: Ensure that the examination room is clean, well-lit, and adequately stocked with necessary supplies such as gloves, lubricant, speculums, swabs, and examination gowns or drapes.
2. Greeting the patient: Introduce yourself to the patient and create a comfortable and supportive environment. Explain the purpose of the examination and ensure the patient's consent.
3. Obtaining the patient's medical history: Review the patient's medical records and obtain relevant information such as previous surgeries, medical conditions, medications, allergies, and menstrual history. This information helps in understanding the patient's background and potential risk factors.
4. Explaining the examination process: Briefly explain the different steps involved in the gynecologic examination, including the use of instruments, potential discomfort, and the importance of relaxation. Answer any questions or concerns the patient may have.
5. Assisting the patient into the appropriate position: Depending on the type of examination being performed (e.g., pelvic exam, Pap smear), assist the patient into the appropriate position, usually lithotomy position (lying on their back with knees bent and legs apart) or modified lithotomy position.
6. Providing privacy and draping: Ensure the patient's privacy by providing a curtain or screen to shield them from unnecessary exposure. Provide the patient with a drape or sheet to cover themselves while maintaining access to the examination area.
7. Assisting with equipment preparation: If necessary, help the healthcare provider gather and prepare the necessary instruments and supplies, such as lubricant, speculums, swabs, or cytology brushes. Ensure that the instruments are properly sterilized and ready for use.
8. Assisting with gloving: Assist the healthcare provider in donning sterile or non-sterile gloves. Ensure proper hand hygiene by washing hands or using hand sanitizer before wearing gloves.
9. Assisting with speculum insertion: During a pelvic examination, the healthcare provider may insert a speculum into the vagina to visualize the cervix. Offer support to the patient, ensuring their comfort and maintaining their dignity.
10. Collecting specimens (if required): If the healthcare provider intends to collect specimens for tests such as a Pap smear, assist in the process by providing necessary equipment, ensuring proper labeling, and handling the specimens appropriately.
11. Assisting with documentation: Help the healthcare provider document relevant findings, observations, and any procedures performed during the examination accurately. This may include taking notes, recording measurements, or using an electronic health record system.
Remember, it's essential to follow the specific protocols and guidelines of the healthcare facility and consult with the healthcare provider for any additional or modified steps they require.
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In a salt solution, what happens to sodium and chloride ions?
A. They stay near the original salt crystal.
B. They become evenly dispersed in the water.
C. They bond with each other, forming a new salt crystal.
D. They bond with each other to form a solvent.
Ions of sodium and chloride are present in a salt solution. In the water, they are uniformly distributed. The Hydrogen atoms combine with the Chloride atoms in a salt solution. With the sodium ions, the oxygen atoms also combine.
Due to electrical charges and the fact that both water and salt molecules are polar, with positive and negative charges on opposite sides of the molecule, salt dissolves in water at the molecular level. The chloride ion is negatively charged, while the sodium ion is positively charged, which is why the bonds in salt compounds are referred to as ionic. A water molecule is also ionic in nature, but the link is covalent because two hydrogen atoms place their positive charges on opposite sides of the oxygen atom, which has a negative charge. Water's covalent bonds are more powerful than salt molecules' ionic bonds, so when salt is combined with water, the salt dissolves.
Thus, we can conclude that a salt solution contains sodium and chloride ions. They are evenly spread out throughout the water.
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Your question is incomplete. Please find the complete question below.
Question: In a salt solution, what happens to sodium and chloride ions?
A. They stay near the original salt crystal
B. They become evenly dispersed in the water
C. They bond w each other, forming a new salt crystal
D. They bond w each other to form a solvent
Why can mutations in one organism function the same way in a different organism?
No only a small percentage of variants cause genetic disorders of the most have no impact on health or development. For example some variants alter a gene DNA sequence.
Which of the following best explains the modern connection between people and food?
Today most people in developed countries hunt or raise their own food
Today most people in developed countries have a scarcity of food sources
Today most people in developed countries are more trusting of food quality
Today most people in developed countries do not know the origin of their food.
Answer:
Today most people in developed countries have a scarcity of food sources.
HURRY I ONLY GOT 20 MINS!! 100 pints
Analyze the given diagram of carbon cycle below.
An image of carbon cycle is shown. The sun, a cloud, two trees, one on the left and the other on the right, an animal, lake, and a factory are shown in the image. An arrow is shown from the sun towards the left tree marked A. The sun is marked B. There is an arrow from the air above the clouds, marked C, towards the left tree. An arrow from a location close to the ground marked D points towards Dead Organisms, which is a label under the animal. An arrow marked E points from the right tree straight up to the clouds. An arrow marked F points from the animal straight up to the clouds. An arrow marked G points from the factory towards the air above the clouds, C. There is an arrow pointing from the air to the lake labeled Carbonates in Water, an arrow pointing down from dead organisms to Fossils and Fossil Fuels, and an arrow from Fossils to the factory.
Part 1: What is happening at location G?
Part 2: Which type of energy transformation is taking place at this location?
Part 3: Justify why this process is a recycling of carbon in the carbon cycle.
Use complete sentences to explain your answer.
Answer:
This is too difficult to read and understand... if you had a diagram I could be able to help more, but I can't figure out exactly what your asking... all I know is part A is CO2 being released into the atmosphere...
Hope you have a great day and if you have a diagram let me know.. I'd love to help :D
Answer:
Part I
At location G, the process of combustion is taking place where hydrocarbon or organic carbon from the fossil fuel is burnt in the presence of oxygen to produce carbon dioxide and water as the products.
CxHy = CO₂ + H₂O
Part II
At point G there is no transformation of energy since during the process of combustion energy will still be stored in form of chemical energy in the bonds of carbon Iv oxide and the water produced during the reaction.
Part III
The process shows recycling of carbon in the carbon cycle. This is because carbon from living organisms is cycled to non living organisms. When plants and animals die and are buried deep in the ground, they are then slowly converted to fossil fuels which contain organic hydrocarbon compounds including petrol, kerosene and other compounds. Then the fossils are used in the industries and undergoes combustion releasing carbon iv oxide which is then released to the atmosphere and used by the plants and animals. The process starts once again.
DISCLAIMER:
THIS WORK AIN'T MINE
I got it from the same question that was answered.