GEOLOGY

Detailed explanation-1: -One of these lineages ultimately evolved into gorillas and chimps, and the other evolved into early human ancestors called hominids.

Detailed explanation-2: -Morganucodon is usually considered the first mammal but its oldest fossils, only represented by isolated teeth, date from around 205 million years ago.

Detailed explanation-3: -Mammals first appeared at least 178 million years ago, and scampered amid the dinosaurs until the majority of those beasts, with the exception of the birds, were wiped out 66 million years ago.

Detailed explanation-4: -The earliest known mammals were the morganucodontids, tiny shrew-size creatures that lived in the shadows of the dinosaurs 210 million years ago. They were one of several different mammal lineages that emerged around that time.