Which Statement About Denitrifiers Is True

Multiple Choice

Which statement about denitrifiers is true?

A) They fix atmospheric nitrogen (N₂) into ammonia.
B) Organisms that act as denitrifiers are exclusively aerobic.
C) They are predominantly prokaryotic archaea.
D) During aerobic respiration, denitrifiers use nitrate or nitrite, rather than oxygen, as the final electron acceptor.
E) They release nitrogen into the atmosphere as nitrogen gas (N₂) .