Across
- 2. Study of of human populations
- 5. Organism that produces its own food
- 7. Scientific study of life
- 9. Process that requires oxygen
- 10. Programed cell death
- 11. Organisms that have a nucleus
- 12. Macromolecule used for energy
- 13. Process by which cells produce gametes
- 15. Reproduction involving two parents
- 16. Part of Earth where life exist
- 17. nonliving factors in an ecosystem.
- 18. Protein catalyst
- 19. Organelle where photosynthesis occurs
- 20. Site of cellular respiration
Down
- 1. Basic unit of life
- 3. First stage of cellular respiration
- 4. Energy molecule
- 6. Maintaining a constant internal environment.
- 8. Mass of rapidly dividing cells
- 10. Without oxygen
- 14. Cells release energy in the absence of O2
- 17. pH less than seven
- 21. Diffusion of water
- 22. Genetic code