Which of the following processes increase(s) the amount of atmospheric carbon in the carbon cycle?
1. photosynthesis
2. cellular respiration
3. combustion
4. b and c
Subtopic:  Nutrient Cycling |
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In the carbon cycle, carbon is found in
1. limestone rock
2. oil, coal, and natural gas
3. living organisms
4. all of the preceding
 
Subtopic:  Nutrient Cycling |
 68%
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