Certain bacteria change nitrogen gas into a usable form in a process called

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In terrestrial ecosystems, some nitrogen-fixing bacteria in soil and root nodules also convert nitrogen gas directly into ammonium ions. ... Other nitrifying bacteria convert the nitrites to nitrates, which plants can absorb. The process of converting ammonium ions to nitrites or nitrates is called nitrification.

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Closing a ring restricts the rotation around individual car bon carbon bonds hope it will you !