Question

How did the extinction of dinosaurs affect the evolution of mammals?

Options

• It opened ecological space for the expansion of mammals

• It caused mammals to become smaller

• It prevented mammals from evolving

• It led to the development of thick-shelled eggs

Answer 1

Following the extinction of dinosaurs around 65 mya, ecological space opened up that allowed mammals to expand and diversify. Mammals, which had been small shrew-like forms during the age of dinosaurs, subsequently became the dominant life forms on Earth.