An ecological pyramid is sometimes used to show both the flow of matter and energy in an ecosystem. The pyramid narrows as matter and energy flow from the bottom to the top. What does this pyramid tell you about the energy in this ecosystem?

A) Energy stays the same. Only the number of living things change.

B) Energy decreases from the top to the bottom as organisms are larger in size.

C) Energy increases from bottom to top because the organisms get larger in size.

D) Energy decreases from bottom to top because some is used at each level for life processes.