Across
- 4. "spiny skin"
- 6. polyps that look like flowers
- 7. round and smooth worms; like spagetti
- 9. involves only one parent
- 13. animals without backbones
- 15. symmetry-2 equal parts; mirror images
- 16. internal skeleton
- 17. worms with flat, thin, ribbon-shaped bodies
Down
- 1. live in shallow, clear water
- 2. medusas
- 3. marine animals with stinging bristles
- 5. earthworms and leeches; ring-like segments
- 8. symmetry-organized around a center
- 10. have soft bodies and hard shells
- 11. reproduction involving male and female
- 12. this phylum includes all sponges
- 14. regrowth of lost body parts