Most of the nitrogen in the environment is in the form of nitrogen gas, which is the form used by most organisms.

Question

Quizplus · Accepted Answer

While nitrogen gas makes up about 78% of the Earth's atmosphere, this form of nitrogen is not usable by most organisms. It needs to be converted into other forms, such as ammonia and nitrate, through processes like nitrogen fixation and ammonification, before it can be used by living things.

Most of the Nitrogen in the Environment Is in the Form