Refer to the Figure

Multiple Choice

Refer to the figure. In an ecosystem, nutrients are highly limiting and prevent NPP from increasing above a certain level.This represents which type of control of energy flow?

A) Top-down control, shown at left
B) Top-down control, shown at right
C) Bottom-up control, shown at left
D) Bottom-up control, shown at right
E) Either top-down or bottom-up, depending on the ecosystem