Across
- 3. The sixth and final criterion of life is that living things reproduce.
- 5. The process of maintaining stable internal conditions.
- 6. Science The study of living things is called life science or biology.
- 7. Cells are surrounded by an outer covering called the cell membrane.
- 10. One of the four nucleotide bases found in DNA.
- 12. The organelle where most of an organism’s DNA is found.
- 13. Special structures that sense conditions of the internal or external environment.
- 17. The region of the brain that regulates temperature and other body functions.
- 18. Jellylike material that fills the cell.
- 19. One of the four nucleotide bases found in DNA.
Down
- 1. Leaves produce food in the form of this sugar.
- 2. The chemical that gives leaves their green color.
- 4. Structures suspended in the cytoplasm that perform specific jobs.
- 8. One of the four nucleotide bases found in DNA.
- 9. All living things are made up of these.
- 11. A DNA molecule is shaped like a ________________
- 14. One of the four nucleotide bases found in DNA.
- 15. The study of living things is called life science or biology.
- 16. The process by which plants combine carbon dioxide and water using sunlight to make sugar.
