Scientific method

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Across
  1. 2. you need to check it's ...
  2. 5. I think that
  3. 6. where the only ones that use it
  4. 8. I see what's going on
  5. 9. something that never changes
Down
  1. 1. always changing
  2. 3. it depends in the weather today
  3. 4. You need it to start
  4. 7. you need evidence