Introduction: In this essay I will talk about two kinds of organisms that are called worms. That's organisms use it in a labs. Which are the flatworm and the roundworms. However, every kind belongs to different phylum, so they are not closely related to each other. Flatworms ( phylum Platyhelminthes) and roundworms ( phylum Nematoda), but there are many similarities and differences between these two types of organisms. Similarity: • There are many similarities between the two groups of worms, Platyhelminthes