Explain the purpose of a molecular clock and the properties that a section of protein must have to be used in this way. < really need !

The molecular clock is a technique that uses the mutation rate of biomolecules to deduce the time in prehistory when two or more life forms diverged. The biomolecular data used for such calculations are usually nucleotide sequences for DNA or amino acid sequences for proteins.


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A measure of evolutionary change over time as the molecular level that is based on the theory that specific DNA sequences or the proteins they encode mutate at constant rates

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Stomach acid is actually hydrochloric acid. Stomach acid is very strong. It can even erode metal if you give it time. Stomach acid breaks down different aspects of food, especially proteins, The body needs broken down particles from food so that it could use it. But, the stomach is not the only thing that breaks down food - the small intestines does too, with bile!

So stomach acid makes food particles smaller so that the body can process it further.