Apentix/AP Environmental Science/Unit 1: The Living World: Ecosystems/Question
AP Environmental Sciencehardmcq1 pt

Why is phosphorus often the limiting nutrient in freshwater lakes?

A.Its only source is slow rock weathering and it has no atmospheric input
B.It evaporates from lakes
C.Bacteria consume all of it
D.It is toxic to algae

Explanation

Core Concept

Without a gaseous phase, phosphorus arrives slowly; adding even a little fertilizer phosphorus can trigger eutrophication.

Correct Answer

AIts only source is slow rock weathering and it has no atmospheric input

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