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

Now knowing that bacteria in soil convert atmospheric nitrogen into a form usable by plants and bamboos are among the most useful of all plants, choose the best answer.


 

        bamboo 