Bridget's Puzzle

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