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

Fact 2: Roundworms make up the roundworm phylum, Nematoda.

Given the two facts above, answer the question "What can the phylum Nematoda be?" with the following options: 
- dangerous
 - parasitic
 - horses
 - meiosis
 - more abundant
 - graptolites
 - homogenous
 - phytoplankton


 

  parasitic       