The respiratory system works with the digestive and circulatory systems to make cellular respiration possible. During cellular respiration, your cells use oxygen and glucose to release energy. Carbon dioxide is a waste product of the process. Carbon dioxide must be removed from cells.
Info from: Google lolz.
I would say that the answer is D.
1,bc the prefix auto=self, like in the word autobiography, where this can be translated into self-biography, or self-writing
