Unit 19 Crossword

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Across
  1. 2. to keep an animal
  2. 5. when you realize there's nothing you can do
  3. 7. to using something else
  4. 8. part of a cell
  5. 9. looks exactly the same
Down
  1. 1. the person who understands you the best
  2. 3. research that studies how traits are passed on
  3. 4. a dog or cat without a home
  4. 6. making an exact copy