Roundworms may be free-living or parasitic, and roundworms make up the roundworm phylum, Nematoda. Given these facts, what can the phylum Nematoda be among the following options:
- dangerous
 - parasitic
 - horses
 - meiosis
 - more abundant
 - graptolites
 - homogenous
 - phytoplankton


 

  parasitic       