Across
- 4. cannot evolve
- 5. a tall giraffe survives, it's offspring are also tall
- 11. tonsils
- 13. the hands of a human and the claws of a lizard
- 14. the place studied initially for evolution
- 16. these can reproduce, resulting in viable offspring
- 17. preserved remains of an organism
- 18. a reptile
- 20. how well an organism can survive
- 21. a distant, but not too distant, relative
Down
- 1. the fins of a seal and the hands of a monkey
- 2. a change in gene frequency over time
- 3. the study of where organisms live
- 6. the mechanism of evolution
- 7. the molecule that codes for protein
- 8. birds studied as a model for evolution
- 9. these evolve
- 10. O+ and AB-
- 12. credited with the Theory of Natural Selection
- 15. the driving force of natural selection
- 19. crossing a seedless grape with a very sweet grape