In Hydra and Planaria mouth involves in both ingestion and egestion. Give reason .
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Expert's answer
2017-04-22T12:15:09-0400
In Hydra and Planaria, the digestive system has only one opening. Two openings develop later during evolution of more complex organisms, such as annelids. Presence of a single opening forces it to function as both mouth and anus, resulting in food intake and egestion.
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