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You are reading an older version of this FlexBook® textbook: CK-12 Earth Science Concepts For Middle School Go to the latest version.

11.25: History of Paleozoic Life

Difficulty Level: Basic Created by: CK-12
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Vocabulary

exoskeleton

exoskeleton

A hard covering that supports and protects an animal's body; shrimp have exoskeletons.
mass extinction

mass extinction

A relatively brief period when a large number of species go extinct.

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Description

Difficulty Level:

Basic

Grades:

6 , 7

Date Created:

Jan 04, 2013

Last Modified:

Jun 16, 2015
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SCI.ESC.742.1.L.2

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