Crossword puzzle

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Across
  1. 5. An organism that shares a common ancestor with another (10 letters)
  2. 7. ,The process by which different species develop from a common ancestor (8 letters)
  3. 8. ,A change in the genetic makeup of a population over time (7 letters)
Down
  1. 1. , A species that no longer exists (8 letters)
  2. 2. Selection ,The survival and reproduction of individuals with traits better suited to the environment (9 letters)
  3. 3. ,The evolutionary process by which unrelated species evolve similar traits (11 letters)
Lamarckism ,The mechanism of evolution proposed by Lamarck, involving the inheritance of acquired traits (9 letters)
  4. 4. ,The process by which organisms change over generations through variations and natural selection (9 letters)
  5. 6. ,The scientific theory proposing that all species of life have descended from common ancestors (8 letters)
  6. 9. ,A structure or trait that has evolved for a specific purpose (7 letters)