Energy flows one way through ecosystems, from the sun to producers to consumers and then eventually lost as heat. Nutrients, on the other hand, cycle within ecosystems as they are taken up by organisms, passed along the food chain, and returned to the environment through decomposition and other processes. Thus, choice D correctly states that energy flows one way through ecosystems, while nutrients cycle within ecosystems.

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Energy

Question 73

Multiple Choice

Energy

A) and nutrients flow one way through ecosystems.
B) and nutrients both cycle within ecosystems.
C) cycles within ecosystems,while nutrients flow only one way through ecosystems.
D) flows one way through ecosystems,but nutrients cycle within ecosystems.

Correct Answer: