I'm almost positive that this is DNA. LMK if I'm correct.
From what i heard, when carbon monoxide is in a person's blood (smoker or non smoker) it can kill you, it is a sign of poison in your blood. With smokers it is worse because they are smoking something that has a high content of carbon monoxide which can cause heart problems, lung cancer, birth defects, etc. So thats what i think
Answer: A. It gives your brain an opportunity to remove waste products that are created when cells fire.
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C. It gives your muscles a chance to repair themselves and/or grow.
Explanation:
I have first-hand experience for C and I am pretty sure A is common knowledge.... Right? Or is it just me?