Which statement is the most accurate about cold air?
C. Warm air rises because it is denser.
B. Warm air sinks because it is denser.
A. Cold air rises because it is denser.
D. Cold air sinks because it is denser.
Answers
Answer:
D. Cold air sinks because it is denser.
Answer:
D
warm water rises bc it is less dense
cold water sinks because it more dense
Related Questions
What is the most reliable, accurate method for inferring phylogenetic relationships?
a. fossil evidence
b. direct observations
c. genetic sequencing
d. tested hypotheses
Answers
Answer:c. genetic sequencing
Explanation:
genetic sequencing s the most reliable, accurate method for inferring phylogenetic relationships.
What is DNA sequencing ?DNA Sequencing can be defined as the order of the four nitrogenous bases which make up the DNA molecule, the sequences define the scientists a kind of genetic information which is carried in a particular DNA segment.
scientists can use these sequence to analyze the stretches of DNA which contain genes and carry regulatory instructions that turn genes on or off.
The information of sequencing data highlight changes in a gene which may cause disease, it is the basis for the mechanism by which DNA molecules are copied during cell division.
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A mitosis inhibitor is a medication that is designed to prevent mitosis in certain cells. Why would these be helpful in the the treatment of tumors?
Answers
Answer:
This would be helpful because mitosis is the way something grows. Cells split apart and what they're inside grows bigger. So if a tumor undergoes mitosis, then it grows. That is bad.
Explanation:
Can I have brainliest please?
2.
Water consists of hydrogen and oxygen bonded together. Therefore water is a(n) *
(1 Point)
Answers
mind map of food and components for class 7
Answers
Answer:
Explanation:
Hope this helps
plz mark it as brainliest!!!!!!!
What is the role of nitrogen-fixing organisms?
Answers
Answer:
Nitrogen-fixing bacteria, microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen.More than 90 percent of all nitrogen fixation is effected by these organisms, which thus play an important role in the nitrogen cycle.The text describes several organelles in eukaryotic cells that seem to operate like bacterium. What relationship does this suggest between prokaryotes and eukaryotes? This suggests an endosymbiotic relationship between prokaryotes and eukaryotes caused eukaryotes to evolve from prokaryotes. Tell me how this evolution happened and what evidence supports this theory.
Answers
Answer:
Answer
Explanation:
Eukaryotes are the cells that make up our bodies, plants and animals and all cellular organisms that contain their genetic material in a nucleus, have a cytoskeleton and contain organelles, such as mitochondria or cytoplasts. Eukaryotes are thought to have evolved from prokaryotes. Bacteria and archaea are classified as prokaryotes, a group of simple, single-cell organisms. Prokaryotes usually contain a single, circular deoxyribonucleic acid, DNA, molecule and lack a nucleus and intracellular organelles.
All living things are made of cells, but not all cells are the same. While a specific cellglossary term (opens in a new window)’s structureglossary term (opens in a new window) depends on the type of cell, some structures are common to all eukaryoticglossary term (opens in a new window) cells. For example, all eukaryotic cells have a nucleus, membrane-bound organelles, a plasma membrane, and cytoplasmglossary term (opens in a new window). The nucleus of a cell surrounds the genetic material with a membrane. Other structures called organelles are also surrounded by membranes. The membranes around the organelles both protect and isolate, helping the organelles work more efficiently. Organelles perform various vital tasks, and each organelleglossary term (opens in a new window) has a specific structure related to its function. Organelles provide the cell with energy, excrete waste products, and make proteins. All eukaryotic cells also have a plasma membrane that envelopes the entire cell. The membrane has many passages through it. These passages chemically control what can enter or leave the cell. All eukaryotic cells also have cytoplasm. This jelly-like fluid fills the cell’s interior and contains thread-like proteins that help the cell keep its shape.
SUMMERIZED PLEASE ILL give brianly est
Answers
Answer:
The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells. The cell is the fundamental unit of structure and function in living things. All organisms are made up of one or more cells. The cell is the basic unit of structure and organization in organisms. Cells arise from pre-existing cells. A cell is the smallest unit that is typically considered alive and is a fundamental unit of life. All living organisms are composed of cells, from just one unicellular to many trillions multicellular. I hope i helped you
Explanation:
What differences did you observe in the structure of an artery versus the structure of a vein?
Answers
Arteries Larger, more muscular and more elastic, carry oxygenated blood from the heart, with the exception of the pulmonary artery. The blood has more pressure from the heart. Veins Under less pressure, so valves are needed. They are less strong than arteries and appear more floppy.
Arteries have thick, elastic, muscular walls whereas veins have thin walls with few elastic fibers. Arteries need these properties to give them the strength and elasticity needed to cope with the high pressure surges of oxygenated blood coming from the heart. Veins carry blood back to your heart from the rest of your body. The pressure of the blood returning to the heart is very low, so the walls of veins are much thinner than arteries.
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Over the next 10 years, many of the UK’s nuclear power stations are expected to close.
Suggest how this may affect the future balance of sources of energy used for electricity production in the UK.
Answers
Answer:
Greatly affected.
Explanation:
This closing of nuclear power stations greatly affect the future balance of sources of energy used for electricity production in the UK because the burden of production comes on other sources such as production of electricity from fossil fuels, wind and solar radiation etc. If electricity is produced from fossil fuels so it leads to pollution of the environment whereas if the electricity is produced from wind and solar radiation, it is very costly but good for the environment.
Make sure you include the following in your chart:
A picture of your chosen organism from each vertebrate class, which includes fish, amphibians, reptiles, birds, and mammals. Please include website reference for every picture you place in your chart. Make sure to use reliable Internet sources that are science-based and created by educational institutions.
A description of your animals’ reproductive process and the reason they are currently endangered.
A list of five physical characteristics and two behaviors for the animals you have chosen. Make sure to include the way they regulate their body temperature as one of the physical characteristics.
List the common ecosystems or geographical area of your animals.
Instructions: Choose five endangered animals, one from each vertebrate class. Then research and complete the table. Don’t forget to include references.
Animal Name Fish (include animal name and photo) Amphibian (include animal name and photo) Reptile (include animal name and photo) Bird (include animal name and photo) Mammal (include animal name and photo)
Physical Traits (list 5 traits, including body temperature regulation)
Animal Behaviors (list 2 behaviors)
Reproductive Processes (at least 2)
Common Ecosystems
Why are they endangered?
Answers
Animals become endangered due to a combination of natural and human-induced factors, including habitat loss and fragmentation, overexploitation, pollution, climate change, introduction of non-native species, and diseases.
Which animal is classified as endangered, and what are its reproductive habits?Vaquita (Phocoena sinus)
Reproductive Process: Vaquitas' mating season typically occurs between April and June. The gestation period lasts around 10-11 months, after which a single calf is born. Vaquitas are known to have a low reproductive rate, with females giving birth to only one calf every two years.Reason for Endangerment: The vaquita is critically endangered due to accidental entanglement in fishing nets, primarily as bycatch in illegal gillnets targeting the totoaba fish. There are currently estimated to be less than 10 individuals left in the wild.Physical Characteristics: small size (up to 1.5 m in length), dark rings around the eyes and mouth, triangular dorsal fin, dark patches on the lips, and a rounded forehead. Vaquitas regulate their body temperature through thermoregulation.Behaviors: Vaquitas are shy and elusive animals, and not much is known about their behaviors. They are typically solitary or found in small groups of up to three individuals.Learn more about endangered species here:
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the largest mass of living material on earth comes from the largest mass of living material on earth comes from microorganisms. plants and animals together. plants. animals
Answers
The correct option is A: Microorganisms
The largest mass of living material on earth comes from microorganisms.
Microorganisms are tiny microscopic organisms that can not be seen through a bare eye.
In order to see them, we need a high-resolution microscope.
Fungi, bacteria, protozoa, and algae are microscopic organisms that are found both in marine and freshwater.
All these organisms are single-celled and occur in the form of colonies.
The first microbes are expected to be present on planet 'earth' since early times and were discovered back in the 6th century in India.
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ou add a fluorescent antibody to a cell surface protein to a dish of cells. Looking at an individual cell under the microscope the entire surface of the cell is fluorescent. You then hit the cell with a brief pulse from a laser which bleaches out part of the fluorescence on the cell. Over time you notice that the entire surface of the cell becomes fluorescent again. What is the best explanation for this observation
Answers
The best explanation for this observation is that the proteins from parts of the cell membrane that were not bleached with the laser diffuse into regions of the membrane that were bleached.
What is an observation?It should be noted that observation means the active acquisition of information from a source.
In this case, the best explanation for this observation is that the proteins from parts of the cell membrane that were not bleached with the laser diffuse into regions of the membrane that were bleached.
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A human baby weighs 8 pounds at birth and 150 pounds as an adult. Which statement is true about the person's growth? I will give anyone a brainiest to anyone who can help me!
Answers
Answer:
Both are actually true.....
Explanation:
The average newborn weighs about 7.5 pounds. Most infants range between 6 and 9 pounds at birth. As a normal human being would weigh around 150 pounds.....
what factors are responsible for increasing the size of a population?
Answers
Answer:
Economic development
Explanation:
1. Natural increase: This refers to the difference between the number of births and the number of deaths in a population. If the number of births is greater than the number of deaths, the population will grow.
2. Immigration: If people move into a population from other areas, it can contribute to population growth.
3. High fertility rates: A high fertility rate, or the average number of children a woman has during her reproductive years, can also contribute to population growth.
4. Increased life expectancy: If people are living longer due to advances in medicine and public health, the population will grow.
5. Changes in social norms: Changes in social norms, such as the acceptance of smaller families, can also impact population growth.
It's worth noting that population growth is not always a positive thing, as it can put strain on resources and the environment. Some countries have implemented policies to encourage smaller families and slow population growth.
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What was known before Franklin and Wilkins conducted their studies of DNA? Select three options.
DNA is found in the nucleus of a cell.
The human genetic code is made of 50,000 genes.
Organisms store and transmit genetic information.
DNA has a double-helix structure.
Cells contain protein molecules.
Answers
The correct answer will be-
1. DNA is found in the nucleus of a cell
2. Organisms store and transmit genetic information
3. Cells contain protein molecules.
Explanation:
The study of DNA started much before the discoveries of Rosalind Franklin and Maurice Wilkins.
Nucleus of cell was discovered by Robert Brown in 1831 but the material present inside the nucleus called "nuclein" (DNA) came from the studies of Johann Friedrich Miescher in 1869.
Proteins as a constituent of cell were discovered by the experimental analysis of Gerhardus Johannes Mulder in 1837.
DNA as a genetic material came from the experimental studies of Frederick Griffith in 1928, Oswald Avery, Maclyn McCarty, and Colin MacLeod in 1944, and Hershey and Chase in 1952.
Franklin and Maurice Wilkins are known for their work on the the structure of DNA as they were able to produce high-resolution X-ray photographs of DNA fibres called Photo 51 in 1952 using X-ray diffraction technique. By 1953 Franklin concluded concluded that DNA shows helical structure with phosphates on outer side.
Thus, 1. DNA is found in the nucleus of a cell
2. Organisms store and transmit genetic information
3. Cells contain protein molecules.
are the correct options.
Answer:
A, C, and E :DD
Explanation:
Hope this helps have a good day :>
Complete the following statement to describe the structure and function of an operon. Choices may be used more than once. Prokaryotes contain genes that are arranged in a(n) and undergo at the same time. These genes typically include a(n) located upstream of the operon that codes for a(n). This controls whether occurs or not. When the repressor protein is bound to the, RNA polymerase cannot bind to the region, so transcription cannot occur and the genes expressed. When the repressor protein is not bound to the, can bind to the region, so transcription occurs and the genes expressed.
Answers
The statements about operons and its function complete as follows:
"Prokaryotes contain genes that are arranged in a(n) operon and undergo transcription at the same time. These genes typically include a(n) regulator gene located upstream of the operon that codes for a repressor protein. This repressor protein controls whether transcription occurs or not. When the repressor protein is bound to the operator, RNA polymerase cannot bind to the promoter region, so transcription cannot occur and the genes are not expressed. When the repressor protein is not bound to the operator, RNA polymerase can bind to the promoter region, so transcription occurs and the genes are expressed".
The operons in prokaryoticOperons are functional units found in prokaryotic DNA that consist of multiple genes organized together along with regulatory elements. They play a crucial role in the regulation of gene expression in prokaryotic organisms.
The typical structure of an operon includes three main components: the promoter, the operator, and the genes themselves. The promoter is a DNA sequence located upstream of the genes and serves as the binding site for RNA polymerase, the enzyme responsible for initiating transcription. The operator is another DNA sequence positioned within or adjacent to the promoter, and its function is to regulate the access of RNA polymerase to the genes.
The key function of an operon is to coordinate the expression of multiple genes involved in related biological processes. Genes within an operon are often functionally related and involved in the same metabolic pathway or share a common regulatory theme. By grouping these genes together, prokaryotes can control their expression as a single unit, which provides advantages in terms of energy efficiency and coordinated regulation.
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Lab #
For Each graph below:
a) LABEL each axis.
b) PLOT your points and CIRCLE/SQUARE each enzyme as directed. Give each a specific COLOR
c) LABEL each enzyme on the graph for clarity.
0°℃
10°C
20°C
30°C
40°C
Circle Plots
Effect of Temperature on Enzyme A Action
Temperature
Rate of Reaction
30°C
40°C
50°C
60°C
70°C
Graphing The Effect of Variables on Enzyme Action
0 mg/s
6 mg/s
10 mg/s
12 mg/s
0 mg/s
Square Plots
Effect of Temperature on Enzyme B Action
Temperature
Rate of Reaction
0 mg/s
4 mg/s
13 mg/s
14 mg/s
0 mg/s
Rate of reaction
a. What is the optimum temperature that enzyme A functions best?
b. What happens to the enzyme activity of A after 30 degrees?
Effect of Temperature on Enzyme Action
c. What is the optimum temperature that enzyme B functions best?
d. What happens to the enzyme activity of B before it reaches 60 degrees?
e. At which temperature do both enzyme A and B both function?
f. Which temperatures do neither enzyme A or B function under?
Comperature (℃)
Answers
The optimum temperature at which enzyme A functions best is 30 °C
The enzyme activity of A decreases after 30 degrees.
The optimum temperature that enzyme B functions best is 60 °C
The enzyme activity of B increases before it reaches 60 degrees.
The temperature at which both enzyme A and B function is 35 °C
The temperatures at which neither enzyme A or B functions are 0 °C and 40 °C.
What are enzymes?Enzymes are biological catalysts that speed up the rate of chemical reactions but remain unchanged chemically at the end of the reactions. enzymes are usually proteins and are therefore sensitive to temperature changes.
The molecules that enzymes may work upon are known as substrates, and the enzyme changes the substrates into new molecules known as product.
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2. Which of the following BEST describes an organic compound?
a compound containing carbon that is important to the survival of living systems
a compound often found inside cells that is destructive to living systems
a compound containing oxygen that is important to the growth of living systems
a compound that attaches to the outside of cells and destroys living systems
Answers
Answer:
a compound containing oxygen that is important to the of living system
Cardiac muscles, one of the three major types of muscles, is found in the walls of the heart. Which one of the following statements is not related to the cardiac muscles?
(a) These muscles show rhythmic contraction and relaxation throughout life.
(b) They do not work according to our will, so they are involuntary muscles.
(c) They are non-striated, multinucleated and branched muscles.
(d) The contraction and relaxation of the heart muscles help to pump and distribute blood to different parts of the body.
Answers
Answer:
B
Explanation:
I am pretty sure that the answer is B
At the end of Chapter 5, Berck and Helfand find compensating variation (CV) and equivalent variation (EV) for wolves in Yellowstone Park - a publicly provided good. Assume wolves are a good to the individual whose preferences we are modeling, i.e., the individual wants more wolves in the wild, all else equal. Suppose there exists 5 wolves in Yellowstone Park, and the average individual has income of \$y. The individual's consumption bundle is A, and the initial indifference curve is I0. Suppose an environmental group provides funds for habitat, and it's expected this habitat will result in 5 more wolves in Yellowstone. Assume the individual's income stays the same. The new consumption bundle is B, and the new indifference curve is I'. Complete the following tasks all on one graph. A. Using our properties of indifference curves (i.e., make them crescent shaped), plot the initial bundle (A) and label with appropriate income and wolf count. Draw the initial indifference curve (I
0
). Be sure to label the graph completely. (Hint: Easiest to place a composite good on the vertical axis, wolf count on the horizontal axis) ( 2 pts) B. Draw the new indifference curve and identify the new consumption bundle (B) while labeling with the appropriate wolf count. ( 2 pts) C. Identify the theoretical consumption bundle (call it C ), that uses the original wolf count but lies on the new indifference curve I'. (2 pts) D. Label the area on the on the vertical axis that corresponds to the EV and CV of these changes. Then in the margins, define CV and EV as it relates to this specific problem
Answers
The initial bundle (A) is represented by the consumption combination (A, I0) with an income of y. Consumer surplus and compensating variation are both concepts in microeconomics that relate to the study of consumer behavior.
The initial indifference curve (I0) is a curved line that slopes upward to the right, indicating that as the individual consumes more of the good, their preference for that good increases, but their preference for the other good remains constant.
The new indifference curve (I') is a curved line that slopes upward to the right, indicating that as the individual consumes more of the good, their preference for that good increases, but their preference for the other good remains constant.
The new indifference curve (I') is plotted on the any type of graph as a curved line starting from the origin, with the vertical axis representing wolf count and the horizontal axis representing income.
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Correct Question:
At the end of Chapter 5, Berck and Helfand find compensating variation (CV) and equivalent variation (EV) for wolves in Yellowstone Park - a publicly provided good. Assume wolves are a good to the individual whose preferences we are modeling, i.e., the individual wants more wolves in the wild, all else equal. Suppose there exists 5 wolves in Yellowstone Park, and the average individual has income of y. The individual's consumption bundle is A, and the initial indifference curve is I0. What is the difference between consumer surplus and compensating variation?
based on your knowledge of the pros and cons of aquaculture versus sustainable harvest of wild species, what is your stance on the best approach for responsible seafood consumption? defend your decision using evidence-based decision making.
Answers
Fish from the wild has better flavor. Compared to farm-raised fish, wild fish have a more varied diet, which improves their flavour.
Leaner beef is used. Because farmed fish provides a reliable supply for an expanding population, even though wild fish may be more nutrient-dense and sustain a more localized economy. fostering appropriate husbandry techniques and protecting the welfare of farmed fish
Farmers have more control over factors since farmed fish are more rigorously inspected than wild fish. In the context of sustainability, decision-making and access to leadership both exist (or do not exist) for fisheries and aquaculture.
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How the Coronavirus pandemic is changing people and our environment?
Answers
Answer:
Explanation:
In the savanna, many animals have adapted a ___________ pattern in which they follow the water and food supply.
Question 3 options:
migration
hibernation
nocturnal
evolutionary
Answers
Answer:
The answer is migration.
the ________ is vital to sleep because it secretes growth hormones.
Answers
Answer:
The pituitary gland
The pituitary gland is vital to sleep because it secretes growth hormones. Sleep is essential for growth because it triggers the release of several hormones.
How pituitary gland secrets the growth hormones?Our brain's pituitary gland is a structure that creates specialized hormones, including growth hormone (also referred to as human growth hormone or HGH). Growth hormone (GH) is released in pulses during the course of a 24-hour cycle.
Early sleep, in temporal conjunction with the beginning of the first period of deep slow-wave sleep, is when normal adult participants have the most consistent and frequently largest GH pulse (SWS).
Therefore, sleep, stress, exercise, and low blood glucose levels all raise growth hormone levels, released by the pituitary gland.
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how could a natural disaster result in genetic drift?
Answers
The fact that some members of a population are more likely than others to live longer and have more offspring, and as a result, pass on more of their genes to the following generation, is the basis for the theory of natural selection.
What is genetic drift?
A large, strong male gorilla is considerably more likely than a smaller, weaker one to become the silverback of the population, the pack's alpha male who mates much more frequently than the other males in the group.
The pack leader will father more children who will inherit half of his DNA and will probably develop into bigger, stronger individuals like their father. The population's frequency of genes for higher size will rise through time, and as a result, the population will generally get bigger.
Small populations are more vulnerable to genetic drift's effects. Large populations, on the other hand, are protected against the impacts of chance.
Therefore, The fact that some members of a population are more likely than others to live longer and have more offspring, and as a result, pass on more of their genes to the following generation, is the basis for the theory of natural selection.
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Which animals male reproductive organ is actually one of its arms?
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during photosynthesis, light energy is initially captured by...
Answers
Answer:
Light energy is initially captured by "photosystems" within thylakoid membranes.
Explanation:
what kind of virus is hiv? a herpesvirus a paramyxovirus a retrovirus a complex virus a provirus
Answers
Explanation:
Hiv is a retrovirus. Your welcome lol
The vital centers for the control of visceral activities such as heart rate, breathing, and blood pressure are located in the:
Answers
Answer:
The vital centers for the control of visceral activities such as heart rate, breathing, and blood pressure are located in the medulla oblongata of the brainstem.
Explanation:
In 2017, you do another round of mark recapture. You first capture, mark, and release 100 rabbits. Then you return a week later and retrap 100 rabbits, 5 of which have marks. How many rabbits are in the population this year?
Answers
Based on the mark-recapture method in 2017, the estimated population size of rabbits this year can be calculated using the formula: Population size = (Number marked in first sample * Number in second sample) / Number of recaptured marked individuals. Therefore, based on the mark-recapture method, the estimated population size of rabbits this year is 400.
To estimate the population size of rabbits in 2017, the mark-recapture method is used. Here are the steps involved:
1. Initial Capture: In the first round, 100 rabbits are captured, marked (e.g., with tags or paint), and released back into the population.
2. Second Capture: A week later, another sample of rabbits is captured, and this time, 100 rabbits are caught.
3. Marked Rabbits: Among the 100 rabbits captured in the second sample, 5 of them have marks indicating that they were previously captured and marked.
4. Applying the Formula: Using the mark-recapture formula, we can estimate the population size of rabbits this year. Plugging in the values:
Population size = (Number marked in first sample * Number in second sample) / Number of recaptured marked individuals
= (100 * 100) / 5
= 2000 / 5
= 400
Therefore, based on the mark-recapture method, the estimated population size of rabbits this year is 400.
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