Answer the following question given this paragraph: 

Roundworms are invertebrates in Phylum Nematoda. Roundworms have a pseudocoelom and complete digestive system. They are free-living heterotrophs or parasites.


Q: Roundworms are intervertebrates that belong to which phylum?

 Choices:

- annelida

- Gordiacea

- amoebozoa

- nematoda

A:
nematoda
