You are presented with the question "Bacteria in the soil convert what type of gas into a form that is used by producers?" and the following answer choices: 
- energy
 - burning
 - food
 - Energy.
 - nitrogen
 - nutrients
 - Cooking
 - a solute

Now knowing that bacteria in soil convert atmospheric nitrogen into a form usable by plants and plants are the primary producers on earth, choose the best answer.


 

     nitrogen    