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Chitinous exoskeleton is one of the key features to the success of arthropods on land because

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it must be occasionally moulted (shed) to facilitate growth.
it enhances respiration through the body surface.
it is impermeable to water and prevents desiccation.
it helps in absorption of moisture.

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detailed solution

Correct option is C

The success of arthropods is derived in large part from the evolution of their unique, non-living, organic, jointed exoskeleton. The epicuticle in the exoskeleton contains waxes that aid in reducing evaporative water loss. It is a good terrestrial adaptation to prevent water loss. The exoskeleton provides support, protection and, with the muscle system, contributes to efficient locomotion.

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