Fact 1: Roundworms make up the phylum Nematoda.

Fact 2: Roundworm Roundworms have complete digestive tracks.

Given the two facts above, answer the question "What kind of digestive tracks do nematoda have?" with the following options: 
- complete
 - homogenous
 - grow
 - allow growth
 - ligt
 - food
 - organ
 - heat or cold


 

 complete        