Unsegmented Worm: worm whose body is not divided into special segments; flatworms and roundworms.
Platyhelminthes: Phylum that consists of simple animals with bilateral symmetry, mostly have a head; flatworms
Flatworm: simple animal with bilateral symmetry belonging to the phylum platyhelminthes
Nematoda: Phylum, with the simplest of animals, exhibiting a digestive system with two openings: a mouth and anus; roundworms
Roundworm: Pseudocoelomate animal that has a digestive system with two openings.
Pharynx: muscular tube used to suck food into the gastrovascular cavity.
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