Across
- 4. a flagellated cell with a collar of protoplasm at the base of the flagellum
- 5. free-living flatworm
- 6. specialized cells that define the phylum Cnidaria
- 8. stinging capsule organelle
- 11. an invertebrate lacking a coelom
- 13. a growth that protrudes from a mucous membrane
- 15. small segments in an adult tapeworm
- 16. outer body covering
Down
- 1. soft-bodied, flattened invertebrates
- 2. the middle layer of an embryo in early development
- 3. major site for food digestion and nutrient absorption
- 5. organisms with patches of mesoderm on their body cavity
- 7. tapeworm head
- 8. also known as "roundworms"
- 9. part of the alimentary canal immediately behind the mouth in invertebrates
- 10. producing both eggs and sperm
- 12. a large aperture in a sponge through which water is expelled
- 14. a free-swimming sexual form of a coelenterate