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

(N/A) 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 appendages allow for greater mobility and versatility on land.
$2$. $A$ hard exoskeleton made of $chitin$ provides structural support and protection against predators and environmental stress.
$3$. The waxy,hard exoskeleton significantly reduces water loss from the body,making them highly adapted to diverse terrestrial conditions.
$4$. They possess a variety of sensory organs and complex behavioral patterns that aid in survival.