The answer to this question is separated
The answer is actually
<em>increased variation in tail feather color because the selection pressure has been relieved</em>
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<em>Good luck!</em>
<em>-RxL</em>
The answer is D. phobias. The little Albert experiment demonstrated that emotional responses can be conditioned in human beings. The 9 months boy was exposed to different stimuli which included a rabbit, masks, a white rat, burning newspapers and a monkey. After some time he was exposed to the white rat and later a loud noise of metal was made and it scared the boy. This exposure was repeated and eventually the boy became afraid of white furry things including animals.
Because they are non renewable sources of energy and they took billions of years to form.