In the last 160 thousand years the human genome has undergone minimal rearrangement, what could be the reason why there is a significant genetic difference between humans and chimpanzees?

• A. There has been a high rate of point mutations, indels, and other small-scale changes
• B. There have been many larger-scale rearrangements that have not been detected
• C. There has a varying degree of selective pressure
• D. There has been a relatively low rate of mutation overall

Answer: (A)