Refer to the Figure

Multiple Choice

Refer to the figure. The algal bed and coral reef ecosystem type and the swamp and stream ecosystem type each have an average net primary productivity close to that of tropical rainforests.However, each makes up a much smaller percentage of Earth's net primary production than do rainforests.What factor accounts for this difference?

A) Latitude with tropical rainforest ecosystems
B) Percent of Earth's surface with tropical rainforest ecosystems
C) Type of ecosystem
D) Average temperature
E) Average precipitation