Across
- 4. structures unused or useless body parts
- 7. theory organelles in eukaryotic used to be free living bacteri
- 10. same structure from common ancestor
- 11. study of development before birth
- 13. organisms traits help survive and reproduce those best fit
- 14. same function but different structure
- 17. evolution on a large scale in a long time
- 19. species mostly stay the same for a long time
- 20. method estimate how long ago species shared a common ancestor
Down
- 1. evolution on a small scale in a short time
- 2. species completely dies out
- 3. species evolves quickly to adapt
- 5. record fossils of past life found on earth
- 6. scientific naming system naming living organisms
- 8. two species evolving similar traits
- 9. control how an animal body develops
- 12. diagram showing relation of different organisms
- 15. group organisms classified together
- 16. trait in species not present in ancestors
- 18. first cell formed when sperm cell and egg cell join