You are presented with the question "Dogs remain what to free-living or parasitic species?" and the following answer choices: 
- hungry for
 - warm-blooded
 - susceptible
 - fertile
 - taken over by
 - more abundant
 - Animal survival
 - friendly towards

Now knowing that roundworms may be free-living or parasitic and dogs remain susceptible to reinfection with hookworms and roundworms, choose the best answer.


 

   susceptible      