RW crossword puzzle

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Across
  1. 6. Study of fossils
  2. 7. Study of skin
  3. 9. Fourth
Down
  1. 1. to measure by the trillionths
  2. 2. heart, vessel
  3. 3. Shape with nine sides
  4. 4. change, process
  5. 5. study of life
  6. 8. eight