4. In grassland regions, rainy seasons and drought seasons determine, in part, the
A kinds of resident organisms
CB location of fresh water streams
C spread of fires
D average temperature

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explanation:

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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.