Chitinous cuticle forms exoskeleton in:

Annelids

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Echinoderms

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Poriferans

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Arthropods

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Solution

The correct option is D Arthropods
Arthropods - The body wall consists of a thick, chitinous cuticle and a single-layered epidermis. The exoskeleton (outer skeleton) of arthropods is made up of a hard substance called chitin. It protects the organisms against predation and desiccation.
So, the correct answer is option D.

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