You are presented with the question "Bacteria in soil convert atmospheric nitrogen into a form usable by what?" and the following answer choices: 
- bacteria
 - human babies
 - food
 - humans
 - lions
 - bamboo
 - Conifers
 - rocks

Now knowing that bacteria in soil convert atmospheric nitrogen into a form usable by plants and bamboos are vigorous, rugged plants, choose the best answer.


 

      bamboo   