Natural Selection

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Across
  1. 3. Last step in the process of speciation
  2. 5. The source of variation in a species' DNA
  3. 7. Number and range of different species that exist on earth
  4. 8. Father of Evolution
  5. 10. First step in the process of speciation
Down
  1. 1. Islands in which Darwin studied the various species of Finches
  2. 2. The idea that different populations are prevented by some mechanism from interbreeding
  3. 4. Slow change in a species over time describes Darwin’s theory of ______
  4. 6. Process by which one species splits into two or more separate species
  5. 9. Competition between members of a species for a particular need is known as selection _____