Across
- 3. - a special cell that sends messages to the brain
- 5. - bone in the middle of our chest
- 6. - a material used to seal bottles of wine
- 8. - the part of a plant that absorbs water
- 9. - the biggest animal
- 10. - a plant cell part that contains cell sap
- 11. - the name of our planet
- 13. - a jelly-like part of a cell where chemical reactions happen
- 16. - bone that protecs the brain
- 17. - the brain of a cell
- 19. - bone used for chewing
- 20. - the biggest type of cat
Down
- 1. - substance in the air that humans need to survive
- 2. - biggest and strongest bone in the body
- 4. - an instrument used to observe small objects
- 5. - the backbone
- 7. - the fastest animal
- 12. - the second level of organization
- 13. - the first level of organization
- 14. - a part of a cell where respiration happens
- 15. - the part of a plant that gets sunlight
- 18. - a female animal that provides milk for humans