You are presented with the question "what can be found in moist soil near rivers and streams in tropical regions?" and the following answer choices: 
- the sun
 - bioaerosols
 - swamp vegetation
 - gravity
 - land fish
 - primitive amphibians
 - peachleaf willow
 - Most plants

Now knowing that caecilians can be found in moist soil near rivers and streams in tropical regions and caecilians are primitive amphibians that resemble earthworms, choose the best answer.


 

      primitive amphibians   