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.
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Biology, 21.06.2019 17:40
There are six elements that make up most of the human body. which of the following is not one of these six elements?
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In iceland, the mid atlantic ridge runs through the center of the contry. what can you conclude about the apperence of iceland many thousands of years from now?
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Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?
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The materials cycled through ecosystems during the nitrogen cycle and the carbon cycle A. Remain at...
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