Question

Which type of nitrogen do most organisms use?

fixed nitrogen

atomic nitrogen

molecular nitrogen

free nitrogen

Answer 1

Fixed Nitrogen.

Step-by-step explanation:

Fixed nitrogen is nitrogen gas, N2, that has been converted to ammonia (NH3, an ammonium ion (NH4, nitrate (NO3, or another nitrogen oxide so that it can be used as a nutrient by living organisms. Nitrogen fixation is a key component of the nitrogen cycle.