Across
- 3. sea fans, secrete a branching skeleton made of proteins
- 4. a sac attached stage (sessile)
- 5. internal layer that lines the gut
- 8. has a ctentacleslocated mouth surrounded by tenticals
- 10. have no bones, no heart, no brain, no real eyes, and respiratory system
Down
- 1. calcium carbohydrate skeletons that form coral reefs
- 2. includes jellyfish, anemones, corals, and sea pens
- 6. one of the most dangerous marine animals
- 7. can be found in unpolluted water like ponds,lakes and streams
- 9. external layer