I believe its the first one
Answer:
Excess nitrogen can cause over-stimulation of growth of aquatic plants and algae. Excessive growth of these organisms, in turn, can clog water intakes, use up dissolved oxygen as they decompose, and block light to deeper waters. So few organisms live in these conditions or even can suffocate and die.
It increases ecosystem productivity, protects fresh water resources, and provides nutrient storage and recycling
Answer:
C.
Explanation:
A lack of exercise is a major cause of chronic disease