Across
- 2. — Powerhouse of the cell
- 3. — Study of living organisms
- 5. — Green pigment in plants
- 8. — Basic unit of life
- 9. — Gas plants absorb during photosynthesis
- 12. — Animal without a backbone
- 14. — Scientist linked to natural selection
- 16. — Largest human organ
- 18. — Animal that eats only plants
- 19. — Jelly-like fluid inside cells
- 20. — Study of ecosystems
Down
- 1. — Process plants use to make food
- 4. — Genetic mixing during reproduction
- 6. — Sugar in the bloodstream
- 7. — Smallest particle of an element
- 10. — Organ that pumps blood
- 11. — Molecule carrying genetic code
- 13. — Tissue connecting muscle to bone
- 15. — Blood vessels carrying blood away from the heart
- 17. — White blood cell that fights infection