Corals in tropical reefs have been shown to contain chemicals that are promising as treatments for
anxiety.
ovarian cancer.
mouth ulcers.
influenza.

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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.