Mammals differinate in the cenozoic era as tigers and saber tooth were at the bottom of the food chain and became the food of dinosaurs but they differentiate and grow in sizes and other features that make them could work they way up to the top of the food chain like today

ANSWER: In the Cenozoic Era, the mammals like Tiger, Woolly Mammoth, Caver Beer, Giant Deers were present. As the dinosaurs were also present during that era, they were at the bottom at the food pyramid and was hunted by the dinosaurs who were classified the category of Reptiles. So, the differentiation was simple to identify between the two.

During the Cenozoic Era, Australia separated, and marsupials evolved.

Explanation:

on edgenuity 2020

maritime tropical may be your answer.