Aperson who's underweight

a. has a decreased ability to fight off disease and poor growth.
b. cannot participate in exercise because of an increased risk of injury.
c. almost always has an eating disorder.
d. will be underweight for the rest of his or her life.

answer; genes dictate the production of specific enzymes, and affected individuals have genetic defects that cause them to lack certain enzymes;

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note: for words found inappropriate, i spelled them out in the phonetic alphabet in parenthesis, so take the first letter of each word to get the word i was trying to spell