When our body gets too hot, we begin to sweat.  When sweat evaporates, thermal energy is transferred to the air outside our body and our body temperature drops. What characteristic of life does this represent?

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trachea, alveoli, lung capillaries, arteries

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.