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3 reasons:

1- their trachea system of respiration is not efficient at a large scale

2- their open circulatory system is not efficient at a large scale

3- as they grow larger the rate at which their mass grows relative to length outpaces the rate at which their strength to length ratio grows. In other words there is a threshold at which they dont have the strength to mover their own mass around. this is constrained due to the use of an exoskeleton rather than an endoskelon

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14y ago

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