Sponges are:

Non-motile

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Planktonic

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Free-swimming

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Pelagic

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Solution

The correct option is A Non-motile
Sponges belong to phylum Porifera. Members of this phylum are generally marine and mostly asymmetrical animals. These are primitive multicellular animals which grow attached to rocks or other substrata. Hence, they are non-motile.
Hence, the correct option is A.

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