Paleozoic Era

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Invertebrates

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do not have a backbone.

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The longest unit of Geologic time

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Eon.

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The shortest unit of Geologic time

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Epoch.

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Many organisms going extinct in a relatively short period of time

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Mass extinction.

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Eons are broken down into smaller units called

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Eras.

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What is the Paleozoic Era?

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

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What significant event marks the end of the Paleozoic Era?

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

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What types of organisms were dominant during the Paleozoic Era?

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Marine invertebrates, fish, amphibians, and early reptiles.

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What is a key characteristic of the Cambrian period?

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The Cambrian Explosion, a rapid diversification of life forms.

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What are trilobites?

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Extinct marine arthropods that were abundant during the Paleozoic Era.