used as a nutrient by plants fixed by bacteria in the soil converted into oxygen absorbed into the atmosphere by lightning
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: After nitrogen becomes part of the lithosphere, what is the next change that nitrogen will undergo?
Possibilities:
- used as a nutrient by plants
- fixed by bacteria in the soil
- converted into oxygen
- absorbed into the atmosphere by lightning

fixed by bacteria in the soil