Biology, 25.10.2019 16:43, martinezarielys17
The materials cycled through ecosystems during the nitrogen cycle and the carbon cycle a. remain at constant levels, although the form and location of the materials can change. b. decrease steadily until more of the materials are added from outside systems. c. increase or decrease based on the number of producers in the ecosystem. d. remain at constant levels and cannot change form or location within the ecosystem.
Answers: 3
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