<span>They have very stable outer electron shells</span>
Water cycle
sun
never
evaporation
transpiration
condensation
precipation
run-off
1: B
2:D
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Answer:
Nitrogen cycle
Explanation:
Nitrogen fixation is the process by which atmospheric nitrogen is converted by either a natural or an industrial means to a form of nitrogen such as ammonia. In nature, most nitrogen is harvested from the atmosphere by microorganisms to form ammonia, nitrites, and nitrates that can be used by plants.