Question

A molecule that can be used as a molecular clock has a neutral mutation rate of one mutation per 10 million years. How many years ago did two species share a common ancestor if the molecules found in these two species differ by a total of six mutations?

A. 6 million years
B. 10 million years
C. 30 million years
D. 60 million years

Answer 1

C: 30 million years

Step-by-step explanation:

Six different things means three on each side

Answer 2

I could be wrong but I think the answer is D