A Diagram of the Flow of Energy Through an Ecosystem

Multiple Choice

A diagram of the flow of energy through an ecosystem resembles a pyramid. This explains why

A) some ecosystems have a higher primary productivity than others.
B) animals need energy for maintenance.
C) there is more grass than zebras, and more zebras than lions, on the African savanna.
D) not every organism at one level of the food chain is eaten by an organism at the next level of the food chain.