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.
Answer:
I think its c Scientists cannot determine how it changes.
d). It increases over time.
Answer:
to break down food into nutrients
