Across
- 4. gradual slow process
- 6. Darwin proposed the theory of Natural selection
- 8. record collection of fossils that show the timeline of life on Earth
- 10. a genetic variation that is helpful to the species
- 12. Error in DNA replication
Down
- 1. Variation Same species, Different traits
- 2. a rock that contains preserved parts
- 3. structure Organisms have similar bone or organ structures
- 5. Selection "survival of the fittest"
- 7. Comparison different species that are alive or extinct to find similarities and differences
- 9. fossil The remains of body parts
- 11. fossil Evidence of the activities of organisms