The form of nitrogen that comprises 78% of atmospheric mass and is necessary for biological processes,but is unusable by plants,is
A)N₂.
B)NOx.
C)N₂O.
D)NO₂.

Question

Quizplus · Accepted Answer

Nitrogen gas, which is represented by the chemical formula N₂, makes up 78% of the Earth's atmosphere but is not directly usable by most plants or animals. Instead, specialized bacteria are needed to convert N₂ into a usable form, such as ammonia or nitrate, through a process called nitrogen fixation.

The Form of Nitrogen That Comprises 78% of Atmospheric Mass