Dinosauria

Example:The ancient reptiles roamed the earth before the emergence of dinosaurs.

Definition:A cold-blooded vertebrate animal that is usually covered with scales and has permeable skin.

Example:The paleontologist studied the fossils found in the rock layers to understand the prehistoric mammals and dinosaurs.

Definition:The remains or impressions of animals or plants of a remote geologic age preserved in petrified or mineralized form, in coal or lignite, or as leaves or pollen grains in amber or as microfossils in limestone.