<span>A mirror neuron is a neuron that fires both when an animal acts and when the animal observes the same action performed by another. Thus, the neuron "mirrors" the behavior of the other, as though the observer were itself acting. Such neurons have been directly observed in primate species.</span>
Basically, because it controls it. It sends all the signals to everything and tells them what to do. Without the brain, nothing would happen, and you would die.
Hope this helps.<span>
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Answer:
They are small because they are small
Explanation:
They want to be small because they are small
Im pretty sure everything exept sound
