Biology #1

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