First slide

Classification of Animals

Question

The skeleton of sponges is not composed of

Easy

A

CaCO₃
B

silica
C

spongin
D

chitin

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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