Question

What happened to South American mammals over evolutionary time?

Options

• They evolved into dinosaurs

• They developed thick-shelled eggs

• They were later replaced or overridden by North American fauna

• They became the ancestors of Australian marsupials

Answer 1

South American mammals were later replaced or overridden by North American fauna. This demonstrates how geographic and ecological factors influence species survival and distribution, with more competitive North American fauna successfully colonizing and dominating South American ecosystems.