Scientific crossword

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Across
  1. 3. variables. Something that is always constant
  2. 4. The ending of something
  3. 7. A study to get an answer
  4. 8. method. How does fertilizer affect plant growth
  5. 9. variable. Something that changes
Down
  1. 1. Educated guess
  2. 2. Something you look up to get the answer to
  3. 5. Something you ask.
  4. 6. variable. Data you collect