Scientists believe that the earth's orbit gradually changes from being elliptical to being nearly circular and then back to elliptical in a period of about 100,000 years. this causes global climatic change. the more circular the earth's orbit, the less the difference in?

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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.