Across
- 3. protective structure typically composed of calcium carbonate
- 4. division of an organisms body
- 6. the preservation and sustainable management of natural resources
- 7. phylum of marine invertebrates
- 10. Taxonomic rank in biological classification
- 12. Animals lacking a backbone
- 14. benefits provided by ecosystems to humans
- 15. Specialized stinging cells found in cnidarians
- 17. organisms that primarily feed on plants
- 18. organisms that primarily feed on other animals
- 19. biological community of interacting organisms
- 20. Variety of life within a specific ecosystem
Down
- 1. Symmetry around a central point
- 2. respiratory organs
- 5. unique hydraulic system in echinoderms for movement
- 8. reproduction without involvement of gametes
- 9. alteration or elimination of natural habitats
- 11. external hard covering
- 13. organism that are attached to a substrate
- 16. organisms that obtain food by filtering particles from water