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

Fact 2: Leeches are external parasites.

Given the two facts above, answer the question "Some what will kill their host, while others won't?" with the following options: 
- barnacles
 - producers
 - scavengers
 - insects
 - cigarettes
 - fungi
 - plants
 - leeches


 

        leeches 