The observation that SNPs account for most of the differences in the coding regions between the human and chimpanzee genomes suggests that ____.

A) the two genomes are too different to suggest an evolutionary relationship
B) Neanderthals descended directly from chimpanzees
C) small changes in amino acid sequences account for big differences in phenotype
D) most of the differences in phenotype are due to DNA sequence changes
E) humans descended directly from chimpanzees