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Birds evolved during the Jurassic.

Dinosaurs are examples of ____.​

Of the three rock types, igneous rocks are the best suited for radiometric dating techniques.

Which animal below is a mammal?​

The Ornithiscian dinosaurs are known as the lizard-hipped dinosaurs.

Tyrannosaurus rex is an example of a theropod, a lizard-hipped dinosaur.

Which mammals reproduce and give birth live young?

In North America, the Devonian period is subdivided into the Pennsylvanian and Mississippian periods.

Dinosaurs were divided into two orders based on whether they were ectothermic or endothermic.

____________ and ____________ are the two primary components of Earth’s current atmosphere.