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Pedicellariae are modified [[1]].

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answer is SPINES.

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Detailed Solution

Pedicellariae are modified spines.

Echinoderms are spiny-skinned, exclusively marine invertebrates having a unique water vascular system. Their body bears small pincer-like structures called pedicellariae.

Pedicellariae are modified spines that help in cleaning the debris off the surface of their body.

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