You are presented with the question "Fungi increase the amount of what in soil" and the following answer choices: 
- one celled organisms
 - organic matter
 - Energy.
 - roots
 - genetic diversity
 - metals
 - Organic compounds
 - air

Now knowing that decomposition increases amount of organic matter in soil and fungi are involved in decomposition, as well, choose the best answer.


 

  organic matter       