Which one is incorrect for phylum $Porifera$?

  • A
    Sponges are primitive multicellular animals
  • B
    $Porifera$ are commonly called sponges
  • C
    Poriferans have $ostia$
  • D
    Sponges have tissue level of body organisation

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Sponges are ..........

Thesocytes serve as

Sponges are

$S$ - Statement: $Leucosolenia$ is an animal belonging to the phylum Porifera.
$R$ - Reason: Animals in this phylum are multicellular and possess a porous body.

Sponges exchange $O_2$ with $CO_2$ by . . . . . . .

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