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9.10: Echinoderms

Difficulty Level: At Grade Created by: CK-12
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Vocabulary

TermDefinition
echinoderm Invertebrate, such as a sea star or a sand dollar, that is characterized by a spiny endoskeleton, radial symmetry as adults, and a water vascular system.
nerve net Interconnected neurons with no central brain.
radial symmetry Symmetry of a body plan in which there are no head or rear ends, so the body can be divided into two identical halves at any point, like a pie.
sea urchin Echinoderm with a round, soft body enclosed in a shell covered with long spines.
water vascular system A network of fluid-filled tubes found in echinoderms.

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Description
Difficulty Level:
At Grade

Concept Nodes:

Grades:
7 , 8
Date Created:
Nov 29, 2012
Last Modified:
Aug 30, 2016
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