The answer is D. All of the above
Answer:<em> Protein not only helps maintain muscle and bone mass, but it's also essential for body growth. Thus, deficiency or insufficiency is especially harmful to children whose growing bodies require a steady supply.</em>
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The body defends itself against pathogens by having a line of defense. These defenses include the skin, mucus, hairs, blood clotting mechanism and, of course, white blood cells
Homeostatic control mechanisms have at least three interdependent components: a receptor, integrating center, and effector. ... The integrating center, generally a region of the brain called the hypothalamus, signals an effector (e.g. muscles or an organ ) to respond to the stimuli.
