the four molecules of life are proteins, carbohydrates, lipids and nucleic acids. Each of the four groups is vital for every single organism on Earth. Without any of these four molecules, a cell and organism would not be able to live. All of the four molecules of life are important either structurally or functionally for cells and, in most cases, they are important in both ways.
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Artificial selection is when humans manually breed certain species to get a different trait, whether it is size or color. The most famous occurrence of this is wolves to dogs.<span />
Answer:
the variable that is being measured or tested in an experiment
Explanation:
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