20. (5 pts.) Summarize the general life cycle of trematodes (flukes) including discussion on Paragonimus westermanni, Schistosoma sp., and Fasciola hepatica. 21. (5 pts.) Summarize the general life cycle of cestodes (tapeworms) including discussion on Taenia saginata, Taenia solium, and Echinococcus granulosus 22. (5 pts.) Most nematodes are dioecious. What does this term mean? To what phylum do nemato des belong? 23. (5 pts.) In which stage of a typical helminth life cycle are most diseases transmitted to humans? Viruses 24. (5 pts.) What are the possible components of a virus? What are their functions?.