The Paleozoic era

Front

The Paleozoic era began how many years ago?

Back

542 million years ago.

Front

What significant event marked the end of the Precambrian period and the beginning of the Paleozoic era?

Back

The Cambrian explosion.

Front

What is the early Paleozoic known as the age of?

Back

Invertebrates.

Front

Periods in the geological time scale are subdivided into what?

Back

Epochs.

Front

Which of the following did not happen in the late Paleozoic? Amphibians disappeared, Amphibians evolved, Reptiles appeared, Coal swamps formed.

Back

Amphibians disappeared.

Front

What major group of animals evolved during the Paleozoic era?

Back

Amphibians and reptiles.

Front

What type of environment was prevalent during the late Paleozoic?

Back

Coal swamps.

Front

What is the significance of the Cambrian explosion?

Back

It marks a rapid diversification of life forms.

Front

What are the three main periods of the Paleozoic era?

Back

Cambrian, Silurian, and Devonian.

Front

What type of organisms dominated the early Paleozoic seas?

Back

Invertebrates such as trilobites.