BIOLOGY  -TEXT
BIOLOGY -TEXT
14th Edition
ISBN: 9781260710878
Author: Mader
Publisher: RENT MCG
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Chapter 28, Problem 3TC

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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Which of the following statements is true about the digestive system of simple invertebrates like sponges and sea anemone? *       No answer One opening only used as anus One opening only used as a mouth One opening for mouth and another opening for the anus One opening which is used as a mouth and anus
What advantage does a digestive system with twoopenings have relative to digestive systems with only a single opening(like that of the flatworms)?
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