Across
- 2. phylum of marine invertebrates including starfish, sea urchins
- 4. external, hard covering made of chitin, providing support
- 7. division of an organisms body into repeating structures
- 10. specialized stinging cells found in cnidarians
- 13. animals lacking a backbone
- 14. taxonomic rank in biological classification
- 15. Reproduction reproduction without the involvement of gametes
- 16. Vascular System unique hydraulic system of echinoderms for movement, feeding, and respiration
Down
- 1. organisms that feed on plants
- 3. Shell protective structure, made of calcium carbonate
- 5. Symmetry symmetry around a certain point
- 6. organisms that feed on other organisms
- 8. organisms that are permanently attached to a substrate and don't move
- 9. variety of life within a specific ecosystem
- 11. Feeder organisms that obtain food by filtering particles from the water, sponges
- 12. respiratory organs in aquatic organisms that extract oxygen from water