The factors that most directly affect blood flow are blood pressure, blood volume, resistance and activity level.
true
Answer:
mitosis, gene expression, differentiation
Explanation:
<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>
It is a protein and it functions in a red blood cell to help carry oxygen
