Phosphorus is often more limiting in freshwater systems because which statement is correct?

Phosphorus is often more limiting in freshwater systems because which statement is correct?

• A. It is the nutrient that controls algal growth in many freshwater systems.
• B. It is usually present in higher concentrations than nitrogen.
• C. It is not essential for aquatic plants.
• D. It is always abundant in soils.

Answer: (A)