To recycle nutrients, an ecosystem must have, at a minimum, A) ...

[penza]

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.

[Millan]

B

[penza]

Thanks for assisting, your answer was right!