You are presented with the question "Some what will kill their host, while others won't?" and the following answer choices: 
- barnacles
 - producers
 - scavengers
 - insects
 - cigarettes
 - fungi
 - plants
 - leeches

Now knowing that some parasites kill their host, but most do not and leeches are external parasites, choose the best answer.


 

        leeches 