Unit 1 Test Review

Front

What was the primary component of the atmosphere during the Precambrian era?

Back

Carbon dioxide from volcanic outgassing.

Front

List the four geological time frames in order from oldest to youngest.

Back

Precambrian Time, Paleozoic Era, Mesozoic Era, Cenozoic Era.

Front

What type of organisms were dominant during the Cenozoic Era?

Back

Mammals.

Front

What is one key difference between the Paleozoic and Mesozoic eras?

Back

The Mesozoic era contained small mammals, while the Paleozoic did not.

Front

What is one similarity between the Paleozoic and Mesozoic eras?

Back

Both eras contained reptiles and amphibians.

Front

What major evolutionary event occurred during the Paleozoic Era?

Back

The Cambrian Explosion, which saw a rapid diversification of life forms.

Front

What significant geological event marks the end of the Mesozoic Era?

Back

The mass extinction event that led to the extinction of the dinosaurs.

Front

What types of environments were prevalent during the Paleozoic Era?

Back

Marine environments, including shallow seas and coral reefs.

Front

What is the significance of the Cenozoic Era in terms of mammalian evolution?

Back

It is known as the 'Age of Mammals' due to the diversification and dominance of mammals.

Front

How did the climate change from the Paleozoic to the Mesozoic Era?

Back

The climate became warmer and more humid during the Mesozoic Era.