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General Biology
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Chitin as an exoskeleton is found in
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A
periplaneta
💡 Explanation:
Chitin forms the exoskeleton in arthropods including Periplaneta (cockroaches). Ascaris and Pheretima are annelids (worms) that lack chitinous exoskeletons. Hydra is a cnidarian and amoeba is a protozoan - neither has a chitin exoskeleton. Chitin provides structural support and protection in arthropods.