Question

please answer these questions which are in attachment?

Answer 1

Hello friend

Your answer of these questions are :

21 ) => choanocytes are collar cells of sponges.Their flagella beat and maintain a water current.

22)=> in both of these groups of animals, bodies developed from two primary germ layers.

23 )=> ostis are inlets of water current and osculum acts as outlet of water current.

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