Agroup of scientists determines that a mitochondrial dna sequence shared by two species has a constant mutation rate. the sequences of mitochondrial dna for the two species are shown below. species a: gactgggcattaspecies b: gaccggacatgausing the principles of molecular clocks and a known mutation rate for this sequence, the scientists determine that these species diverged from a common ancestor 30 million years ago. based on this information, how much longer do you predict it would take these species to differ by a total of seven base pairs? a. 60 million yearsb. 20 million yearsc. 140 million yearsd. 40 million years