Answer:
D
Explanation:
Most drugs are addictive and it is highly likely that "once" will turn out to be "just once more", and "it couldn't hurt to do it just once more".
<span>They benefit from having the respiratory </span>system<span> give oxygen and take away carbon dioxide. Muscle </span>cells benefit<span> by having circulatory </span>system<span> bring them blood and oxygen. The heart pumps blood towards the arteries, arteries carry blood to the </span>cells<span>.</span>
Answer:
Narcotic pain relievers work by binding to receptors in the brain, which blocks the sensation of pain.
Explanation:
