Bridget's Puzzle

12345678910111213141516171819202122
Across
  1. 2. The study of structures of organisms
  2. 4. The change in the allele frequencies over generations
  3. 7. Changes followed by periods of stability
  4. 9. When a species die off due to a catastrophic event
  5. 11. All of the genes in a population
  6. 12. Parts of an animal that have the same function but different use
  7. 15. The migration of species in and out of populations
  8. 16. The species in an area
  9. 17. When two different species evolve with each other and form a special bond
  10. 18. Biological change that makes descendants look different
  11. 19. The study of embryonic similarities in species
  12. 20. The organisms that survive live to reproduce more than others
  13. 22. The study of where species live
Down
  1. 1. A species dying out slowly, ex: climate change
  2. 3. When one species eventually become two different species
  3. 5. If a body part has similar characteristics resulting from a common ancestor
  4. 6. Two animals came from a common ancestor
  5. 8. Even if it is not best for the species the females choose some males over another
  6. 10. Proof of prehistoric life
  7. 13. The study of prehistoric life
  8. 14. The study of how two species are related due to genes
  9. 21. A group of organisms that can reproduce with one another