The layer of cells surrounding which structure is a characteristic feature of poriferans?

  • A
    Canal
  • B
    Spongocoel
  • C
    Ostia
  • D
    Osculum

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What is the location and function of collar cells?

Which of the following is a boring sponge?

Sponges can be identified by the presence of .........

$A$ skeleton made of spongin fibres occurs in

Collar cells occur in

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