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