Front

Invertebrates

Back

do not have a backbone.

Front

The longest unit of Geologic time

Back

Eon.

Front

The shortest unit of Geologic time

Back

Epoch.

Front

Many organisms going extinct in a relatively short period of time

Back

Mass extinction.

Front

Eons are broken down into smaller units called

Back

Eras.

Front

What is the Paleozoic Era?

Back

A major era in Earth's history, spanning from about 541 to 252 million years ago, characterized by the emergence of diverse life forms.

Front

What significant event marks the end of the Paleozoic Era?

Back

The Permian-Triassic extinction event, the largest mass extinction in Earth's history.

Front

What types of organisms were dominant during the Paleozoic Era?

Back

Marine invertebrates, fish, amphibians, and early reptiles.

Front

What is a key characteristic of the Cambrian period?

Back

The Cambrian Explosion, a rapid diversification of life forms.

Front

What are trilobites?

Back

Extinct marine arthropods that were abundant during the Paleozoic Era.