Across
- 6. Animal with a backbone
- 7. Study of birds
- 10. Study of mollusks
- 14. Specialized structure within a cell
- 15. Science of classifying living things
- 16. Simple, single-celled organism without a nucleus
- 17. Organism made up of multiple cells working together
- 18. Study of plants
- 20. Grouping of closely related species, above species and below family
Down
- 1. Giving birth to live young
- 2. Ancient, single-celled organisms that live in extreme environments
- 3. Basic unit of life
- 4. animal with four limbs
- 5. Organism that eats meat
- 8. Study of fish
- 9. Organelle that digests waste materials in a cell
- 11. Cell structure involved in cell division
- 12. Single-celled organism that moves and feeds by changing shape
- 13. Highest taxonomic rank, grouping of one or more kingdoms
- 19. Group of tissues performing a specific function