Perhaps 100,000 years is a better analogy for a week in evolution. A lot can happen in 100 million years of evolution. The boreoeutherian ancestor, that is the

Perhaps 100,000 years is a better analogy for a week in evolution. A lot can happen in 100 million years of evolution. The boreoeutherian ancestor, that is the ancestor of all humans, rodents, carnivores, cetaceans and more was alive roughly that many years ago.