Which Statement About Ecosystems Is True

Multiple Choice

Which statement about ecosystems is true?

A) Chemicals flow through ecosystems in a one-way direction and are not recycled.
B) Energy continually cycles through an ecosystem.
C) Some organisms can produce their own food and these organisms form the base of the food chain.
D) Within an ecosystem there is a community of organisms, but non-living components are absent.
E) The location of ecosystems around the world appears to be random. There is no relationship between ecosystem location and factors like climate.