A rigid exoskeleton is characteristic of
A)cnidarians.
B)sponges.
C)chordates.
D)echinoderms.
E)arthropods.

Name: A rigid exoskeleton is characteristic of A)cnidarians. B)sponges. C)chordates. D)echinoderms. E)arthropods.
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Question

Quizplus · Accepted Answer

A rigid exoskeleton is a hard, protective outer layer that covers the body of some animals. Arthropods, such as insects, crustaceans, and arachnids, have a rigid exoskeleton made of chitin, a tough polysaccharide.

A Rigid Exoskeleton Is Characteristic of