Across
- 4. random genetic changes thought to create new characteristics
- 6. structures that share a similar anatomical pattern
- 7. type of anatomy that compares different species
- 9. anything that prevents two species from mating (2 words)
- 11. type of selection where nature favors advantageous traits
- 12. type of selection in which man chooses desirable traits
- 13. evolutionary origin of the universe (2 words)
- 15. he suggested the "survival of the fittest" idea
Down
- 1. type of ecology that studies the actions and responses of living things
- 2. groups of similar organisms that can interbreed
- 3. dating methods based on nuclear decay
- 4. the evolution of inorganic compounds
- 5. the idea that all living things share common ancestors: descent with _?_
- 8. a structure that has lost its function or usefulness
- 10. gradual changes that result in biodiversity of species
- 14. a type of fossil used to date rack layers