evolution and natural selection

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Across
  1. 3. Change over time
  2. 4. Allows for immunity to a disease
  3. 5. Same species
  4. 6. Preserved remains of an organism
  5. 7. organelle that performs photosynthesis
  6. 9. creation of a new species
  7. 11. cell containing no nucleus
  8. 15. All organisms evolve from each other
  9. 16. Contain a nucleus and membrane bound organelles
  10. 17. product of reproduction
  11. 18. Stops gene flow
  12. 19. struggle for survival
Down
  1. 1. Cellular respirationon that doesn't use oxygen
  2. 2. Species dies out
  3. 4. Structures that are no longer used by organisms
  4. 8. Performs cellular respiration
  5. 10. Some traits are strengthened or weakened
  6. 12. Variety of living things on Earth
  7. 13. Both prokaryotes and eukaryotes contain this organelle
  8. 14. Characteristics of organisms that helps to enhance their chance of survival