You are presented with the question "Plants are the major producers in biomes defined by their what?" and the following answer choices: 
- the environment
 - competition
 - plant life
 - animal life
 - heat produced
 - vegetation
 - water life
 - plant sources

Now knowing that plants are the major producers in terrestrial biomes and terrestrial biomes are defined by their plant life, choose the best answer.


 

   plant life      