The Theory of Evolution

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Across
  1. 2. "The Origin of ...", Darwin's book
  2. 6. A diagram that shows the evolutionary paths of different species
  3. 8. The changes that help species to survive
  4. 9. The bird whose beak Darwin drew sketches of
Down
  1. 1. Darwin proposed "The survival of the ..."
  2. 3. "Natural ..." keeps the best-adapted genes
  3. 4. An insect that can have lighter or darker speckles
  4. 5. "HMS ...", the name of Darwin's boat
  5. 7. It helps rabbits to hear foxes if these are long