Question

Biologists use molecular clocks to try to measure _____.

-when a molecule was created
-how long molecules have existed
-when two species separated from a shared ancestor
-when two species will merge to become one species

Answer 1

The answer is C. When two species separated from a shared ancestor. Hope I helped:)

Answer 2

I am pretty sure that biologists use molecular clocks to try to measure when two species separated from a shared ancestor. Do hope you still need the anwer because this one is definitely correct, do not hasitate to use it! Regards.