Discuss the parasitic aspects of the phylum Nematoda. Use examples.
a. Nematodes are free-living organisms and do not exhibit parasitic behavior.
b. Many nematodes are parasitic, such as Trichinella, which causes trichinosis, and Wuchereria, which causes elephantiasis.
c. Nematodes only parasitize plants, not animals.
d. Nematodes are exclusively parasitic and do not have any free-living species.
