Why can't insects grow much bigger?

Insects can't grow monstrously large like in some B-movies because of the three hormones which regulate body size. One controls how fast an animal grows and depends on insulin and similar hormones that prompts cells to divide and multiply. The other two hormones regulate growth duration and timing of maturation. Of course there is also the gravity which will crush the animal to the ground because of the huge body mass and weak legs.

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