Why have the reflex arc evolved in animals?
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Reflex arc have evolved in animals inorder to take sudden and involountary actions which are required in certain circumstances where emergency response is required to save body from situations which may lead to danger.lf they were not evolved ,then it would take much time to respond to the stimuli as it is volountary action thus may be not at right time and can even become dangerous.
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Answer:
reflex arcs have evolved in animals because the thinking process of the brain is not fast enough
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