The recycling of nitrogen in the environment in which nitrogen goes from a gas, to organic compounds in the soil, to proteins in a plant or nitrates, and then is again released into the atmosphere as a gas is known as what?

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Multiple Choice

The recycling of nitrogen in the environment in which nitrogen goes from a gas, to organic compounds in the soil, to proteins in a plant or nitrates, and then is again released into the atmosphere as a gas is known as what?

This question is about how nitrogen moves through air, soil, and living things in a continuous loop. Nitrogen starts as N2 gas in the atmosphere, some bacteria convert it into usable forms like ammonium or nitrate, plants take up those forms to build proteins and other organic nitrogen compounds, and when organisms die or waste is decomposed, microbes return nitrogen to the soil as ammonium and, through further steps, back into nitrogen gas that goes into the atmosphere. This back-and-forth between gas and organic forms is the nitrogen cycle, the process that explains the sequence described: gas, to organic soil compounds, to plant proteins or nitrates, and back to atmospheric gas. The other options don’t describe this full loop. Nitrogen fixation is just the part that converts N2 gas into usable forms, not the entire cycle. The phosphorus cycle and carbon cycle involve different elements and pathways.

This question is about how nitrogen moves through air, soil, and living things in a continuous loop. Nitrogen starts as N2 gas in the atmosphere, some bacteria convert it into usable forms like ammonium or nitrate, plants take up those forms to build proteins and other organic nitrogen compounds, and when organisms die or waste is decomposed, microbes return nitrogen to the soil as ammonium and, through further steps, back into nitrogen gas that goes into the atmosphere. This back-and-forth between gas and organic forms is the nitrogen cycle, the process that explains the sequence described: gas, to organic soil compounds, to plant proteins or nitrates, and back to atmospheric gas.

The other options don’t describe this full loop. Nitrogen fixation is just the part that converts N2 gas into usable forms, not the entire cycle. The phosphorus cycle and carbon cycle involve different elements and pathways.

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