Task: Text Categorization
Input (English): A subgroup of this phylum is considered paraphyletic because of its non- parasitic nature; that subgroup is Turbellaria. Another species in this phylum grows large numbers of proglottids, which detach and release eggs. These organisms extract reusable material and send it into other cavities by using flame cells. This phylum is the cause of the second-most devastating parasitic disease, schistosomiasis. Because they lack an internal body cavity, they are classified as acoelomates. Name this phylum of flatworms which includes planaria and tapeworms.
Output (English): Science