Nitrogen returns to the atmosphere through a process called (1 point)
O denitrification.
O nitrification.
O nitrogen cycle.
O nitrogen fixation.
The first one
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Nitrogen returns to the atmosphere through a process called denitrification.
The correct answer is denitrification. Denitrification is the process by which nitrogen returns to the atmosphere. Now, let's break down the other options to understand why they are not the correct answers:
1. Nitrification: Nitrification is the process by which ammonia is converted into nitrate ions by bacteria. It is an important step in the nitrogen cycle, but it does not involve nitrogen returning to the atmosphere.
2. Nitrogen cycle: The nitrogen cycle refers to the series of processes by which nitrogen is converted between different chemical forms in the environment. It includes processes like nitrogen fixation, nitrification, and denitrification. While denitrification is a part of the nitrogen cycle, it specifically refers to the return of nitrogen to the atmosphere.
3. Nitrogen fixation: Nitrogen fixation is the process by which atmospheric nitrogen is converted into a usable form, such as ammonia or nitrate, by certain bacteria. It is an important step in the nitrogen cycle, but it does not involve nitrogen returning to the atmosphere.
Therefore, the correct answer is denitrification, as it specifically refers to the process of nitrogen returning to the atmosphere.