Spicules occur in:

Annelida

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Mollusca

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Porifera

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Platyhelminthes

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Solution

The correct option is C Porifera
Spicules are the structural elements in the skeleton of sponges i.e. in phylum Porifera.
Spicules may be calcareous if they are made up of calcium carbonate or they may be siliceous if they are made up of silica.
So, the correct answer is option C- 'Porifera'.

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