Presence of exoskeleton-Small size of arthropods

Question

How does presence of the exoskeleton describe basic small size of the arthropods?

Answer 1

Because they have periodic ecdysis and exoskeleton, growth of arthropods is imperfect to avoid animal becoming susceptible to environmental injury. There are however a number of arthropod species with relatively large-sized individuals, like ‘giant’ cockroaches, spiders and crabs.