You are presented with the question "What does bacteria in the soil help to prevent?" and the following answer choices: 
- contamination
 - colder weather
 - Pollution
 - anemia
 - plant stress
 - Greenhouse gasses
 - toxins
 - disease

Now knowing that bacteria in soil convert atmospheric nitrogen into a form usable by plants and nitrogen deficiency increases the stress on the plants, choose the best answer.


 

     plant stress    