evolution

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Across
  1. 2. 2 species evolve together
  2. 4. how species evolve
  3. 5. two species cant interbreed
  4. 9. fossils left behind by animals
  5. 10. two unrelated species share traits
  6. 13. opposite of allopatric speciation
  7. 14. alleles drift apart
  8. 15. 2 different organisms evolve from the same ancestor
  9. 17. two species cant breed together
  10. 19. two organisms help or hurt eachother
  11. 20. when organisms change
  12. 21. the study of embryos
Down
  1. 1. when new species are formed
  2. 3. these help figure out whats in strata
  3. 6. organisms change to their environment
  4. 7. two species are isolated by a geographical feature
  5. 8. shares similar characteristics
  6. 11. discovered natural selection
  7. 12. one species evolves into multiple forms
  8. 16. discovered by darwin
  9. 18. 2 species evolve in similar ways