Fact 1: Bacteria in soil convert atmospheric nitrogen into a form usable by plants.

Fact 2: Bamboos are vigorous, rugged plants.

Given the two facts above, answer the question "Bacteria in soil convert atmospheric nitrogen into a form usable by what?" with the following options: 
- bacteria
 - human babies
 - food
 - humans
 - lions
 - bamboo
 - Conifers
 - rocks


 

      bamboo   