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Answer to Question #67597 in Other Biology for Sana

Question #67597
In Hydra and Planaria mouth involves in both ingestion and egestion. Give reason .
Expert's answer
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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