You are presented with the question "What may be free-living or parasitic?" and the following answer choices: 
- insects
 - parasites
 - bushes
 - nematodes
 - trees
 - bacteria
 - animals
 - Most plants

Now knowing that roundworms may be free-living or parasitic and nematodes are microscopic roundworms, choose the best answer.


 

    nematodes     