Break nutrition
Energy growth
Cell repair
The bones for the fingers and the toes are the phalanx.
Appetite is not linked to hunger since appetite is the activity and drive in order to eat whereas hunger is the physical and mental state in which a person needs to eat.
Also appetite is linked to many unhealthy behaviors that can result to other symptoms of eating disorders which causes deletrious effects on one's mental and biological state.
I believe the answer is B, although im not exactly sure what a skin fold test is for, im sure this is the right answer.