Fact 1: Plants are the major producers in terrestrial biomes.

Fact 2: Terrestrial biomes are defined by their plant life.

Given the two facts above, answer the question "Plants are the major producers in biomes defined by their what?" with the following options: 
- the environment
 - competition
 - plant life
 - animal life
 - heat produced
 - vegetation
 - water life
 - plant sources


 

   plant life      