Question

A major diversification of what animal group occurred about 50 million years ago, possibly spurred by worldwide climate change?

Answer 1

mammals

The supertree also shows that another major diversification of mammals occurred about 50 million years ago. Again, worldwide climate change may have been one reason. This time Earths temperature rose. The warmer temperature led to a greater diversity of plants. This would have meant more food for mammals or their prey.