Spongin fibres are secreted by

  • A
    Choanocytes
  • B
    Pinacocytes
  • C
    Amoebocytes
  • D
    Spongioblasts

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Animals devoid of respiratory,excretory,and circulatory organs belong to the phylum:

In sponges,the canal system develops due to:

Sponges are

In most sponges,the structures for asexual reproduction are called .........

Assertion : Sponges have body organization of "cellular level".
Reason : There is some physiological division of labour.

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