Can someone pls help . I WILL MARK U BRAINLIEST

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Explanation:

Population sizes never stay stable, they might increase or decrease depending on living situations and the environment around them.

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.