Skin cells are made of proteins, water, and fat. But brain cells are only made up of amino acids, which ca make protein.<span />
I believe that the answer is D. If something has evolved, it can not interbreed with its old species. I think this is right!
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<span>Grasslands are one of the most widespread of all the major vegetation types of the world. This is so, however, only because human manipulation of the land has significantly altered the natural vegetation, creating artificial grasslands of cereal crops, pastures, and other areas that require some form of repetitious, unnatural disturbance such as cultivation, heavy grazing, burning, or mowing to persist. This discussion, however, concentrates on natural and nearly natural grasslands.
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<span>Sensory and motor nerves make up the central nervous system.</span>
