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Which of the following changes contributes to an adolescent’s lessening susceptibility toward respiratory infections? A. more exposure to germs because of the increase in social activity B. shrinkage of the lymphoid system C. increase in sex hormones D. growth spurt

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Which of the following changes contributes to an adolescent’s lessening susceptibility toward respiratory infections?

A. more exposure to germs because of the increase in social activity
B. shrinkage of the lymphoid system
C. increase in sex hormones
D. growth spurt

 
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