Fact 1: Roundworms may be free-living or parasitic.

Fact 2: Internal parasites harm their hosts in many ways.

Given the two facts above, answer the question "What can roundworms do?" with the following options: 
- killing insects
 - Make money
 - survive
 - Start fires
 - Harm hosts
 - Harm themselves
 - protect them
 - reproduce


 

     Harm hosts    