ZoologyA single opening helps with both ingestion and egestion in which of the following?

A single opening helps with both ingestion and egestion in which of the following?

  1. A

    Roundworms

  2. B

    Flatworms

  3. C

    Hagfishes

  4. D

    Starfishes

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    Solution:

    Digestive system in flatworms is incomplete with a single opening both for ingestion and egestion.

    It is complete in roundworms, starfishes and hagfishes.

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