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

Explanation

The following might be the reasons for the arthropods to be the largest group of animal kingdom.
(1) They are the first phylum to have well developed digestive, circulatory and respiratory systems.
(2) Their body is covered by ch itinous exoskeleton which helps them survive extreme conditions.
(3) They are usually small and reproduce heavily compared to all other phyla and hence constitute a higher number.
(4) They have highly developed sensory organs like antenna, eyes (compound and simple) statocysts etc., which helps them keep themselves safe from predators. Arthropoda can be found every where in the world , even in the volcanic springs where survival is of greater challenge. They are present in water , air and on land and they have evolved themselves to suit to all conditions.
(5) They are omnivores and can feed on both plant and animal matter.
(6) Organisms are present in all the types of habitats i.e., aquatic, terrestrial and arboreal.