1. What process changes nitrogen gas (N_(2)) from the air into a form that plants can use? a)Denitrification b) Nitrogen fixation c) Nitrification d)Ammonification

b) Nitrogen fixation<br /><br />Nitrogen fixation is the process that converts nitrogen gas (N₂) from the air into a form that plants can use, such as ammonia (NH₃) or related compounds.