For attaining and maintaining mental and emotional health you should get regular exercise and eat nutritious food because exercise relieves stress. Exercise<span> and other physical activity produce endorphin—chemicals in the brain that act as natural painkillers—and also improve the ability to sleep, which in turn </span>reduces stress<span>. </span>
Answer: Exhaled air consists of 78 percent nitrogen, 16 percent oxygen, 4 percent carbon dioxide and potentially thousands of other compounds.
Explanation: Does this help???