ZoologyThe skeleton of sponges is not composed of

The skeleton of sponges is not composed of

  1. A

    CaCO3

  2. B

    silica

  3. C

    spongin

  4. D

    chitin

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    Solution:

    The skeleton of sponges consists of calcareous (CaCO3) spicules, siliceous spicules or spongin fibres. 

    Chitin forms the exoskeleton of arthropods.

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