Answer :
Final answer:
Nitrogen fixation (1) and denitrification (4) are essential processes that move nitrogen from the atmosphere into the soil, aiding in making nitrogen accessible to living organisms.
Explanation:
Nitrogen fixation (1) and denitrification (4) are the parts of the nitrogen cycle involved in moving nitrogen from the atmosphere into the soil. Nitrogen fixation is when nitrogen gas is converted into forms that plants can use, and denitrification releases nitrogen back into the atmosphere. These processes are crucial for making nitrogen available to living organisms in the ecosystem.
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