If you don't know how that kind of thing works, you are likely to make mistakes regarding it. If you know how it works, you can prevent yourself from making mistakes that could endanger yourself and/or others.
Answer
6=C
7=All of the above
Explanation
The first one A, Nutrition. Nutrition takes in and uses the food to creat nutrient substances to restore energy, grow, to repair itself, and calories.
Answer: Nutrition.
