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The first two in part B please:)

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.

. ph changes the ability of them he enzyme to dissolve in water.

you know they are heterozygous for a trait because they have it as jj or jj.