Question

multiple choice question applying a known mutation rate for a gene to the number of dna sequence differences between species, biologists can use a(n) ________ to estimate the time that two species last shared a common ancestor. isotopic decay ratio molecular clock biogeographical index allometric growth rate

Explanation:

The molecular clock uses mutation rates in DNA to estimate time since a common ancestor. Isotopic decay ratio is for geology, biogeographical index for species - location, and allometric growth rate for body - size relationships.

Answer:

molecular clock