Answer:The respiratory and circulatory systems bring oxygen and nutrients to the cells. The respiratory and circulatory systems work together to maintain homeostasis. The respiratory system moves gases into and out of the blood. The lungs contain the bronchi, bronchioles, and alveoli.
Explanation:
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Ruin your family life, and physical life. you will not have good friends, loose money, and everytime you drink/do drugs there is a chance that your next is your last (you dying) its very unsafe and can make you mean and irritatable when you are having a withdrawal (not good) you become desprate and might even steal to get money for more