You are presented with the question "What are hosted, but don't usually kill their host?" and the following answer choices: 
- ferns
 - deadly viruses
 - insects
 - tapeworms
 - bacteria
 - orchids
 - deadly diseases
 - white blood cells

Now knowing that some parasites kill their host, but most do not and tapeworms are internal parasites of vertebrates, choose the best answer.


 

    tapeworms     