Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 24, Problem 2FIB

Bilaterally symmetrical animals have __________ embryonic tissue layers, known as __________, __________, and __________. Radially symmetrical animals have __________ tissue layers; they lack the __________ layer.

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