To Recycle Nutrients, an Ecosystem Must Have, at a Minimum

Multiple Choice

To recycle nutrients, an ecosystem must have, at a minimum,

A) producers.
B) producers and decomposers.
C) producers, primary consumers, and decomposers.
D) producers, primary consumers, secondary consumers, and decomposers.
E) producers, primary consumers, secondary consumers, top carnivores, and decomposers.