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What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom ? 

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The phylum Arthropoda consists of more thantwo-thirds of the animal species on earth. The reasons for the success of arthropods are as follows.
(i) Jointed legs that allow more mobility on land.
(ii) Hard exoskeleton made of chitin that protects the body.
(iii) The hard exoskeleton also reduces water loss from the body of arthropods making them more adapted to terrestrial conditions.
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