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

Fact 2: Some of the more common parasites are various types of 'worms'.

Given the two facts above, answer the question "What do some worms do to their hosts?" with the following options: 
- Copy them
 - reproduce
 - Play with them
 - harm them
 - Show them things
 - Kill them
 - migrate
 - Damages them


 

      Kill them   