Which Statement About Nitrogen Metabolism Is True

Multiple Choice

Which statement about nitrogen metabolism is true?

A) The nitrifiers convert atmospheric nitrogen gas into ammonia (NH₃) .
B) The nitrifiers return nitrogen to the atmosphere as nitrogen gas (N₂) .
C) The nitrogen fixers convert ammonia to nitrate or nitrite.
D) The denitrifiers convert ammonia to nitrate or nitrite.
E) The nitrogen fixers convert atmospheric nitrogen gas into ammonia (NH₃) .