Across
- 1. the formation of a new species
- 7. changes in a gene pool by chance events
- 9. the range of phenotypes within a species
- 10. the highest level of classification of living things
- 11. a theory about the origin of the diversity of living things
Down
- 2. where many species form from divergent evolution
- 3. one of four selection pressures
- 4. living things that can interbreed to produce fertile offspring
- 5. the loss or disappearance of a species from Earth
- 6. a change in the genetic code leading to genetic variation
- 8. changes in a gene pool by emigration and immigration