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

Fact 2: Killing means death.

Given the two facts above, answer the question "what do some parasites do to their hosts?" with the following options: 
- Move to another area
 - harm them
 - leeches
 - Damages them
 - impregnate
 - cause their death
 - They may not survive.
 - ticks


 

      cause their death   