Across
- 2. an animal lacking a backbone
- 5. the method used to give organisms scientific names
- 7. having a body temperature varying with that of the environment
- 8. the branch of science concerned with classification, especially of organisms
- 9. a phylum of aquatic invertebrate animals that comprises the sponges.
- 10. a hard outing covering an organism
Down
- 1. maintain a constant body temperature, typically above that of the surroundings, by metabolic means
- 3. a phylum of aquatic invertebrate animals that comprises the coelenterates
- 4. an animal with a backbone
- 6. a group of primitive jawless vertebrates which includes the lampreys, hagfishes, and many fossil fishlike forms