If organ systems failed to work together your body would not work because your heart pumps blood in order for your whole body to work.
B. Interpreting a complicated medical term that you have not encountered before
A person suffering from anorexia nervosa typically suffers from low blood pressure, thin/weak bones, and damage to internal organs.
So the answer would be D (all of the above)
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Increased height
increased muscle mass
increased hair growth