Natural Selection

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Across
  1. 3. the oldest fossils are always found at the _______
  2. 5. remanent of an ancient organism that has been preserved
  3. 6. _________ selection
  4. 10. when genes move from one population to another, increases variation
  5. 12. survival of the __________
  6. 13. the name of the scientist who proposed the theory of natural selection
Down
  1. 1. change in an organism's DNA
  2. 2. "peppered ________ "
  3. 4. species changing over time
  4. 7. the youngest fossils are always found at the ____
  5. 8. Darwin notices that these were different on the finches
  6. 9. when genes randomly change over time, decreases variation
  7. 11. the island name where Charles Darwin studied