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Moving substances into and out of the cell is an active part of
maintaining equilibrium, or |
with continuous
adjustments to keep the cell within normal limits.
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the animal that would be cutest if scaled down to the size of a cat? elephant

the electromagnetic energy from the sun arrives in the form of visible and invisible light.

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.