Answer :<em> That trough time, a specie of animal, plant, bacteria can change.
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<em>When a life form reproduces, one of its"babies" may be different from its parents because of genetic mutation. </em>
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The neck is the Cervicis.
Hope this helps
Since it is the hearts job to pump blood throughout the body of the organism, the circulatory system would fail and the entire organism would suffer if the heart cells stopped working properly.