Choanocytes are present in

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(B) Choanocytes,also known as collar cells,are the characteristic cells of the phylum $Porifera$ (sponges).In sponges,the internal lining of the canal

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Sycon

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(B) Choanocytes,also known as collar cells,are the characteristic cells of the phylum $Porifera$ (sponges).In sponges,the internal lining of the canal system and the $spongocoel$ is formed by these choanocytes.Among the given options:$A$. $Physalia$ belongs to the phylum $Cnidaria$ (Coelenterata).$B$. $Sycon$ belongs to the phylum $Porifera$ (sponges),thus it possesses choanocytes.$C$. $Pleurobrachia$ belongs to the phylum $Ctenophora$.$D$. $Echinus$ (sea urchin) belongs to the phylum $Echinodermata$.Therefore,the correct option is $B$.

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