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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.

As _____________ and ______________ separated, the Gulf of Mexico began to form.

The has only been one supercontinent throughout Earth’s history.

Throughout Earth’s history, the composition of the atmosphere has changed.

Most continents contain large central areas in which very ancient rocks are exposed. These areas are called ____.​