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Existence of exoskeleton-small size of arthropods

How does the existence of exoskeleton elucidate the general small size of arthropods?

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As they have exoskeleton and periodic ecdysis, the development of arthropods is restricted to avoid the animal becoming vulnerable to environmental damage. There are though several arthropod species with relatively big-sized individuals, such as giant crabs, cockroaches and spiders.

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