The state of maintaining a stable internal environment regardless of changing external conditions is called .
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.
The biosphere. This is the layer that contains all life on the planet.