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