To develop a molecular clock, you need to find which of the following? a sequence of molecules the rate at which changes occur in a type of molecule how much total change has occurred in a type of molecule from two different species how many molecules a species has

Explanation:

The rate is the answer because we need to study oscillations inside molecules structures. So, rate is the ratio of speed that use to change its structure periodically and that's all we need to measure time.

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