Carbon dioxide emissions cause ocean acidification. Ocean acidification reduces coral growth. If ocean acidification continues, corals may become extinct. This is an example of a/an ___________ type of cause of extinction.
A)
population risk
B)
environmental risk
C)
natural catastrophe
D)
genetic risk

Animals: Invertebrates

A body plan is a set of morphological characteristics that are shared by the majority of the members of a phylum. It includes a specific symmetry, certain layers, the segmentation type, and the disposition of nerves, limbs, and gut.

A sac body plan refers to the presence of a gut cavity that has only one opening, which serves both the functions of the mouth and anus.

Some groups with this body plan are Cnidaria (jellyfish), Porifera (sponges), and Platyhelminthes (flatworms).

So, of the options, only Annelida DOES NOT have a sac body plan, given that its members have a mouth and an anus. So A is the correct option.

Answer:

yes it is true

Explanation:

In this sentence, the word "anticipation" means a feeling of excitement or eagerness about a future event. Specifically, it refers to the excitement that one feels about the prospect of pausing on the hilltop and having a lot of potential energy before flying down. I

What is Potential Energy ?

Potential energy is the energy that an object possesses by virtue of its position, condition or state. There are various forms of potential energy, such as gravitational potential energy, elastic potential energy, electric potential energy, chemical potential energy, etc. Gravitational potential energy, for instance, is the energy that an object possesses by virtue of its position above the ground in the Earth's gravitational field.

The word "anticipation" is often used to describe the feeling of excitement or eagerness that one has about a future event. In the given sentence, the author is describing the experience of being on a hilltop, which is a precursor to the exciting experience of flying down the hill. The author states that the anticipation of pausing on the hilltop and having a lot of potential energy is almost as fun as the actual experience of flying down the hill.

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The steps in how a nerve impulse moves from one neuron to another will be:

The brain and spinal cord make up the central nervous system, one of the two major components of the nervous system. All of the body's parts are connected by nerves that emerge from the spinal cord and make up the peripheral nervous system.

Electrical changes across the neuron membrane result in the transmission of a nerve impulse along a neuron from one end to the other.

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It is transported across the plasma membrane with the help of  the energy molecules. It is the transport ions and the transport molecules that help to facilitate the  transport.

It is the bi layer of lipids with the association of proteins in it.

ATP that are the energy molecules called as energy currencies as well. It is the molecule of the energy that helps in the transportation of molecules through it. The ATP is broken down into the ADP with the Pi ion and this breakdown gives out the energy libation for the reaction.

Active transport does require the  cellular energy in order to achieve the movement. There are 2 types of  the active transport : primary active transport which uses the  adenosine triphosphate (ATP) and secondary active transport which uses the electro chemical gradient.

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Answer:

The punnet square in this question is unclear. The punnet square has been attached as an image.

Based on the punnet square, the answer is C. Two long, two short

Explanation:

This question involves a single gene coding for needle length in cactus plant. The allele for long needle (L) is dominant over the allele for short needle (l).

According to the question, two cacti were crossed with genotypes Ll and ll respectively. The following allelic combinations of gametes will be produced by each parent

Ll- L and l

ll- l and l

Using these gametes in a punnet square (as seen in the image below), four possible offsprings with genotypes: Ll and ll will be produced in a 1:1 proportion.

Ll offsprings will be phenotypically long-needled while ll offsprings will be phenotypically short-needled. Hence, two long needle offsprings and two short needle offsprings will be produced in this cross.

Answer:

The air in the lungs has a higher concentration of oxygen than that of oxygen-depleted blood and a lower concentration of carbon dioxide. This concentration gradient allows for gas exchange during respiration.

Explanation:

Liver cells use different genes than the heart cells use.

Answer:

hjknm

Explanation:

Answer:

In contrast to light microscopes, electron microscopes use a beam of electrons instead of a beam of light. Not only does this allow for higher magnification and, thus, more detail, it also provides higher resolving power.

From the test results, the victim is O+. The clumping indicates the presence of a rhesus factor.

There are four human blood groups which are;

A person can have any of these blood groups. Those who have blood group O lack antigens A and B in blood hence they do not agglutinate in a blood test with antibodies A and B.

Also, the fact that there is clumping in the rhesus test indicates that the blood is rhesus positive.

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Answer:

innervation of the upper limbs

The brachial plexus is a nerve network located at the base of the neck and the axillary fossa associated with sensory and motor innervation for the entire upper limb.

It is responsible for providing the motor (muscle), sensory and sympathetic innervation of the upper limb.

Through it, the spinal cord is connected with all the peripheral nerves of the upper limbs and all the sensorimotor information of these segments is also transmitted.

Therefore, we can conclude that the brachial plexus is a nerve network located at the base of the neck and the axillary fossa associated with sensory and motor innervation for the entire upper limb.

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Answer:

For natural selection to occur, it is true that there must be genetic variation in the population.

Explanation:

According to evolution, natural selection implies the changes that occur in the genotype of a species, due to the effect of environmental factors, and which guarantee its survival through adaptive evolution.

For natural selection to occur, three fundamental conditions must exist:

A trait that can be inherited from one generation to another.

The trait is subject to variability between subjects of the same species.

Genetic variability can determine the possibility of reproductive success and survival.

Therefore, a necessary factor for natural selection to occur is that genetic variability exists in the population.

For natural selection to occur :-

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Answer:

temporary

Explanation:

ice is just water in solid state, and melting it returns it to the liquid state. you can always re freeze water

Answer:

Y and B are 16 map units apart

Answer:

The chocolate lover bought 6 boxes of chocolate, each containing 12 truffles

Explanation:

mark me brainly

Answer:

The chocolate lover bought 6 boxes of chocolate, each containing 12 truffles. How many truffles did she buy?

Feedback interactions with the human body are essential because they play a crucial role in maintaining homeostasis, which refers to the body's ability to maintain a stable internal environment despite external changes.

These feedback mechanisms allow the body to detect and respond to deviations from normal conditions, ensuring that physiological processes remain balanced.

In the human body, feedback interactions typically involve a control system consisting of a sensor, a control center, and an effector. The sensor detects changes in the body's internal environment, such as temperature or hormone levels. The control center receives and processes the information from the sensor, determining the appropriate response. The effector then carries out the response, restoring or adjusting the body's conditions back to the desired set point.

Through feedback interactions, the body can regulate various processes, including body temperature, blood glucose levels, pH balance, heart rate, and hormone secretion, among others. These mechanisms enable the body to respond to internal and external stimuli, ensuring optimal functioning and promoting health.

Without feedback interactions, the body would be unable to detect and correct deviations, leading to imbalances and potentially harmful consequences. Feedback mechanisms are vital for maintaining the stability and overall well-being of the human body.

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On ribonucleoprotein particles called ribosomes, protein synthesis takes place in the cytoplasm.

The nucleus is one of the organelles responsible for protein synthesis. Ribosomes. the RER, or rough endoplasmic reticulum. The carbohydrate components of glycoproteins are modified and synthesized during protein processing in the Golgi. The alteration of a N-linked oligosaccharides that were found with proteins in the ER is one of the main features of this processing. Endoplasmic reticulum & ribosomes are the two cells that make proteins. Endoplasmic reticulum (RER), a network of linked flattened sacs found in the eukaryotic cell's cytoplasm and essential for protein synthesis, is where the ribosomal that is synthesising the protein is directly bonded to the ER membrane.

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If i´m incorrect please correct me, Thank you!

The area that appears dark on the surface of the Sun is called sunspots. These are storms on the Sun's surface.

Sunspots are caused due to disturbance in Sun's magnetic field heading up to the photo-sphere.

Sunspots can last from few days to few months and eventually decay. They can expand or contract as they move across the Sun's surface.

Thus, the correct option is B.

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Answer:

c

Explanation:

If there are no producers in the food chain, then there would be no food for the consumers and decomposers and the food chain will collapse. Thus, the correct option will be A.

A food chain can be defined as a linear network of links in a food web with the starting organism from the producers and ending at an apex with the predator species, detritivores, or the decomposer species.

Plants can make their own food through the process called as photosynthesis. Using the energy from the solar radiation (sun), water and carbon dioxide from the atmosphere and other nutrients, they chemically synthesize their own food. Since, they can make or produce their own food they are known as the producers.

Therefore, the correct option will be A.

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Answer:

mouth ⇒ oesophagus (gullet, food pipe) ⇒ stomach ⇒ duodenum ⇒ ileum ⇒ colon ⇒ rectum ⇒ anus

Explanation:

Answer:

A

Explanation:

its a

The most likely explanation here is that mitochondria was once a prokaryotic organism. The correct option is A.

Mitochondria are membrane-bound cell organelles that produce the majority of the chemical energy required to power the cell's biochemical reactions (mitochondrion, singular).

The mitochondrial energy is stored in a small molecule known as adenosine triphosphate (ATP).

Mitochondria are special compartments (organelles) in our cells best known for their role as powerhouses, converting food molecules into ATP, a molecular fuel for the rest of the cell.

Mitochondria and chloroplasts most likely evolved from engulfed prokaryotes that were once self-contained organisms.

At certain point, an aerobic prokaryote was engulfed by a eukaryotic cell, which then formed an endosymbiotic relationship with the host eukaryote, eventually developing into a mitochondrion.

Thus, the correct option is A.

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Pumping CO2 gas into a greenhouse system is significant for several reasons. Greenhouse gases like CO2 are essential for plants to carry out photosynthesis, which is the process by which they convert sunlight into food. By adding CO2 to a greenhouse, it can help to increase plant growth and yield.

Here are some reasons why pumping CO2 into a greenhouse system is important:

Increased photosynthesis: Photosynthesis is a chemical process in which plants use sunlight to convert carbon dioxide and water into glucose, a form of sugar that is used as food. The addition of CO2 to the greenhouse system can help to increase photosynthesis, which means that plants will produce more food. This can result in faster growth, bigger plants, and higher yields.

Improved plant health: CO2 is essential for plant growth and can help to improve the overall health of the plants. By adding CO2 to the greenhouse system, it can help to create an environment that is more conducive to plant growth. This can lead to healthier plants that are less susceptible to disease and pests.

Improved crop yields: One of the most significant benefits of pumping CO2 into a greenhouse system is that it can increase crop yields. By increasing the amount of CO2 in the air, plants are able to produce more food, which can result in bigger, healthier plants with larger yields. This can be particularly beneficial for commercial growers who rely on high yields to generate income.

In summary, pumping CO2 gas into a greenhouse system is an effective way to improve plant growth and yield. By increasing the amount of CO2 in the air, plants are able to carry out photosynthesis more efficiently, which can lead to healthier plants and higher crop yields.

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In the ladder analogy of the DNA molecule, the "steps of the ladder" are paired nitrogen bases.

The DNA molecule is made up of two strands of nucleotides that create a double helix as they coil around one another. The sugar molecule, the phosphate group, and the nitrogenous base are the three parts that make up a nucleotide. The nitrogenous bases serve as the ladder's rungs or "steps," pairing with one another to form hydrogen bonds that hold the DNA molecule's two strands together.

The nitrogenous bases adenine (A), thymine (T), cytosine (C), and guanine (G) are the four types found in DNA (G). The genetic code of an organism is made up of base pairs, which always couple adenine with thymine and cytosine with guanine. The genetic information that is transferred from one generation to the next is determined by the arrangement of these base pairs along the DNA molecule.

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Statements 1 and 3 are true, while statements 2 and 4 are false.The first energy transformation in the scenario is chemical energy to kinetic. - True.

The archer converts chemical energy stored in their muscles into kinetic energy when they release the string and propel the arrow forward.From the time the archer draws the bow until the thud is heard, entropy increases in the universe. - False. Entropy is a measure of disorder or randomness in a system. In this scenario, the archer's actions do not necessarily lead to an increase in entropy.

The energy of the arrow at the end of the scenario is equal to the energy exerted by the muscles of the archer. - False. Energy is conserved in a closed system, but some energy is lost as heat and sound during the process. Therefore, the energy of the arrow at the end may be less than the energy exerted by the archer's muscles.

When the arrow sticks into the tree, the original energy has all been used up. - False. Energy is not created or destroyed but rather transformed from one form to another. Some of the initial energy from the archer's muscles is transferred to the arrow's kinetic energy, but it is not entirely used up.In summary, statements 1 and 3 are true, while statements 2 and 4 are false.

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Answer:

Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function.

Explanation:

Exhaling removes waste from the body by expelling carbon dioxide through the respiratory system.

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The statement about obesity that is false is: (a) It is associated with proteinuria.

Obesity is a condition characterized by an excess of body fat. It is a major risk factor for a variety of health problems, including diabetes, cardiovascular disease, and certain types of cancer. However, it is not directly associated with proteinuria, which is the presence of excessive amounts of protein in the urine. Proteinuria can be a sign of kidney damage or disease, but it is not directly caused by obesity. The other statements about obesity are all true. Weight loss can reduce the risk of kidney disease in people with diabetes, obesity increases the risk of complications after transplant surgery, it increases the risk of mortality in dialysis patients, and it is associated with hypertension

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