Explanation:
They are useful as they can predict the genetic probability of a particular phenotype arising in a couple's offspring. In other words, it can tell you if you will or will not have a certain trait.
A scientist may use molecules - enzymes, proteins, DNA, RNA - to test for similarities, because if anatomy alone was used, it would be difficult to link traits and characteristics between the two organisms. For example, a rabbit has an endoskeleton and a closed circulatory system, while a fly has an exoskeleton and hemocoel.
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All cellular activities in living organisms use ATP as a source of energy. This is through cellular respiration, which is absolutely essential to sustaining life.
