Fact 1: Some parasites kill their host, but most do not.

Fact 2: Tapeworms are internal parasites of vertebrates.

Given the two facts above, answer the question "What are hosted, but don't usually kill their host?" with the following options: 
- ferns
 - deadly viruses
 - insects
 - tapeworms
 - bacteria
 - orchids
 - deadly diseases
 - white blood cells


 

    tapeworms     