The Earth's Natural History

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