Evolution

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Across
  1. 2. Makes up all of the fossils that have been found on Earth
  2. 7. When many species die off around the same time
  3. 9. Passed from parent to offspring via genes
  4. 10. A species becomes better formed to fit its environment over many years
  5. 11. To change in response to a change in the environment
  6. 12. Models the relationships between different lineages and their common ancestors
  7. 13. Selection the idea that the organisms best formed to fit their environment are more likely to survive
  8. 15. Ancestral group of organisms that is shared by multiple lineages
  9. 16. Remains of an organism that lived long ago
  10. 18. An unusual change in an individual organism
  11. 19. Features that evolved independently along different lineages but have similar function
Down
  1. 1. A way to tell how old something is by studying its chemical properties
  2. 3. Where fossils are usually found
  3. 4. Animal that is closest related to humans
  4. 5. Gene differences in a population
  5. 6. All organisms in a species have died out
  6. 8. Large organism that lived long ago
  7. 14. Features resulting from common ancestry
  8. 17. Physical features of modern organisms