Exhaled air has more carbon dioxide because the blood contains some carbon dioxide (a waste product) that is transferred to the air in the lungs, which is then exhaled. The result is that the exhaled air contains less oxygen and more carbon dioxide than the inhaled air. The air in the lungs also becomes humidified with water before it is exhaled.
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A friend is a person whom one knows and with whom one has a bond of mutual affection, typically exclusive of sexual or family relations.
Homeostasis is maintaining an equilibrium or balance. Human bodies only function under very specific conditions, so it is important to maintain them through homeostasis. Otherwise, the proper conditions to function will be missing and we won't be able to function at all.
