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: 2
Biology, 22.06.2019 02:00
Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d
Answers: 1
Biology, 22.06.2019 03:30
Multicellular organisms use cell division, mitosis, for growth and the maintenance and repair of cells and tissues. single-celled organisms may use cell division as their method of reproduction. regardless of the reason for mitosis, the process ensures genetic continuity. what is the step in the cell cycle that ensure genetic continuity?
Answers: 3
The materials cycled through ecosystems during the nitrogen cycle and the carbon cycle A. Remain at...
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