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

The phylum, Arthropoda, consists of more than two-thirds of the animal species on earth. The reasons for the success of arthropods are as follows.
1 Jointed legs that allow more mobility on land
2 Hard exoskeleton made of chitin that protects the body
3 The hard exoskeleton also reduces water loss from the body of arthropods making them more adapted to terrestrial conditions.

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