Fact 1: Roundworms may be free-living or parasitic.

Fact 2: Parasites Shortfin makos host a variety of parasitic copepods.

Given the two facts above, answer the question "Roundworms can be free-living or live on a what?" with the following options: 
- soil
 - nest
 - host
 - root
 - stem
 - habitat
 - food
 - commune


 

   host      