Answer:
Cellular Energy
Explanation:
Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration. Cellular energy is required to acheive this movement.
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<span>Vitamin D.
Vitamin D is made from 7-dehydrocholesterol and needs UV light in order to be activated. Because the children are not exposed to sunlight, they are receiving insufficient UV light.</span>
After the solar cycle takes place, bigger sun spots appear, flares appear, and the solar radiation changes.
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Answer:
returns to the left heart, completing the pulmonary cycle
Explanation:
