The reason why humans and chimpanzees share most of their nucleotide sequences yet exhibit significant phenotypic differences is that many of the most important sequence differences alter regulatory sequences. So the correct option is C.
The closest living relatives of humans are chimpanzees. Humans and chimpanzee ancestors diverted approximately 6,5–7,5 million years ago.
There are many genetic features that distinguish us from chimpanzees and make us humans. Human and chimpanzee genomes have undergone multiple genomic changes after their ancestor lineages diverted.
These changes include deletions and duplications of DNA sequences, single nucleotide substitutions, chromosomal rearrangements, and insertion of transposable elements.
Therefore, the correct option is C.
Read more regulatory sequences, here https://brainly.com/question/12416838
#SPJ4