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Success of arthropods is mainly due to

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segmentation

open circulation

trachea

chitinous exoskeleton

answer is D.

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Detailed Solution

Success of members of Arthropoda is mainly due to chitinous exoskeleton and jointed appendages.

Body is covered by a chitinous cuticle which offers protection and prevents water loss from the body. It also provides the space for muscles to attach. It undergoes moulting, or ecdysis to facilitate growth.

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