THE CYCLE.
Four main cycles to consider are:
The nitrogen cycle. Nitrogen circulates between air, the soil and living things.
The carbon cycle. Carbon dioxide circulates between the air, soil, and living things.
Photosynthesis. This process followed by respiration recycles oxygen.
The water cycle.
What is the most important cycle?
One of the most important cycles on earth, the carbon cycle is the process through which the organisms of the biosphere recycle and reuse carbon.
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