Evolution

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Across
  1. 3. sped the process of evolution
  2. 10. one of the conditions for natural selection
  3. 11. remains of once living things, record of evolution
  4. 12. marked the beginning of life
  5. 14. not found in Earth's early atmosphere
  6. 15. suggest that organisms once shared a common ancestor
Down
  1. 1. energy that made the first complex molecule
  2. 2. change in a species over time
  3. 4. evidence that shows how at an early stage all vertebrates are similar
  4. 5. inherites characteristics that increases chances for survial
  5. 6. maybe a result of endosymbiosis
  6. 7. maybe a result of endosymbiosis
  7. 8. increases fitness in a population
  8. 9. structure that no longer serves a purpose
  9. 13. ancestor Darwin believed that the Galapagos fincehs shared a _________ __________