Answer
A. Phosphorous is a limiting nutrient in many aquatic systems.
Work Step by Step
A is the answer because there is not a lot of Phosphorous that will leak into water supplies, so it is often the limiting nutrient in aquatic systems.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.