Lice have been with us and evolving with us for as long as we have existed. Votes: 3
D.N.A. sequences change by mutations, and the idea behind the molecular clock is that those changes occur at, more or less, a constant rate, over time. Votes: 0
The loss of body hair is interesting to anthropologists, because it is a feature that distinguishes us from our nearest living relatives, chimpanzees. They have body hair, we don't. Votes: 0