Evolution Crossword

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Across
  1. 4. differentiations in genetics
  2. 6. _____ "as such" - the theory that the world and the organisms in it are constantly changing
  3. 7. all of life can be traced back to the same few ancestors
  4. 11. "creating" a new organism by combining two from distinct populations
  5. 12. extinction on a large scale
Down
  1. 1. organisms fight each other to survive
  2. 2. organisms pick up survival instincts over time
  3. 3. evolution occurs little by little over a lengthy span of time
  4. 5. more organisms are produced than can live
  5. 8. author of "On the Origin of Species"
  6. 9. survival of the fittest
  7. 10. main organism that gave Darwin insight on evolution