EP BIOLOGY,AP ED. -1 YR EBK.SUBSCRIPT.
EP BIOLOGY,AP ED. -1 YR EBK.SUBSCRIPT.
12th Edition
ISBN: 9780076758050
Author: Mader
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 28, Problem 2TS

Cnidarians such as Hydra have only one opening. which must serve as both mouth and anus. In contrast, most animal species have a one-way, tubelike digestive system, with separate openings for intake and output. Describe some specific advantages of the latter arrangement.

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