A molecule that can be used as a molecular clock has a neutral mutation rate of one mutation per 40 million years. How many year
s ago did two species share a common ancestor if the molecules found in these two species differ by a total of eight mutations? 160 million years 320 million years 100 million years 240 million years.
IT is not very hard because all you have to do is since it is only 40 million per one rotation and you have eight of them, then it is 320 because 4 times 8 equals 32.
