MediumZoologyAnimal Kingdom
+4 / -1
The skeleton of sponges is made up of:
A
Bones and cartilage
B
Spicules or spongin fibres
C
Chitin
D
Calcium carbonate shells
Explanation
Sponges are supported by a skeleton made of calcareous or siliceous spicules or proteinaceous spongin fibres.
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The specialized cells in sponges that line the spongocoel and canals are:
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