In ecosystems,why is the term cycling used to describe the transfer of chemical elements,whereas the term flow is used for energy exchange?
A)Chemical elements are repeatedly used,but energy passes through and between ecosystems.
B)Photosynthesis results in transforming chemical elements with no effect on energy transfer.
C)Chemical elements flow between ecosystems,whereas energy stays within one ecosystem.
D)Photosynthesis alters system energy without a change in the number of chemical elements.

Question

Quizplus · Accepted Answer

Chemical elements, such as carbon and nitrogen, are reused and recycled within ecosystems. This means that they are cycled between different organisms and the environment. Energy, on the other hand, is constantly flowing through ecosystems and cannot be reused or recycled. It enters as sunlight and exits as heat. Therefore, the term cycling is used for chemical elements and the term flow is used for energy exchange.

In Ecosystems,why Is the Term Cycling Used to Describe the Transfer