To preserve and keep them fresh
<span>The circulatory system is vital in the exchange of oxygen with the cells in the animal's body because there is no living creature that can survive without oxygen, it keeps the body active.
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Answer:
desire (libido), arousal (excitement), orgasm and resolution.
Explanation:
The sexual response cycle has four phases: desire (libido), arousal (excitement), orgasm and resolution.
If you expose yourself to much to toxicity or overall what you eat/ air bruv..
The answer is A. to see if samples contain the same DNA.