Which of the statements explains how chimpanzees and humans can be so different with such similar genomes? a. the genetic differences could have occurred in regulatory regions of genes responsible for development. b. the anatomical and behavioral differences between chimpanzees and humans are not that large. c. different environments between the two populations influenced the anatomical and behavioral differences. d. the human population is so much larger than the chimpanzee population that we benefit from more genetic variation. e. none of the other answer options is correct.