Across
- 2. have dry, scaly skin
- 5. Animals without a backbone
- 7. Have moist skin and no scales
- 9. Are vertebrates that live their entire lives in water
- 12. Don't have tubes
- 14. Are vertebrates with feathers
- 15. Is joined with the name of the smallest group, the species
- 16. Have hair and produce milk for their young
Down
- 1. Animals that have a backbone
- 3. This act of grouping things by using a set of rules
- 4. Kingdom also have only one cell
- 6. Is the largest group into which living things can be classified
- 8. Kingdom has only one cell
- 10. A group of living organisms consisting
- 11. Have nuclei, and most are many celled
- 13. Have tubes