Spicules are found in

Hydra

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Planaria

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Sycon

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Obelia

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Solution

The correct option is B Sycon
In Poriferans like Sycon, the body is supported by a skeleton made up of spicules or spongin fibres. Hydra, Planaria and Obelia are not Porifera animals and accordingly lack spicules. Hydra and Obelia are Cnidarian while Planaria is a Platyhelminth.
So, the correct answer is 'Sycon'

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