kay265
kay265 kay265
  • 22-04-2017
  • Physics
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I need to know the answer to the question

I need to know the answer to the question class=

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PrinceMinusB
PrinceMinusB PrinceMinusB
  • 22-04-2017
I would go with A. An Observation. Because he's looking at visual differences, for example: "based on smell, color change, and release of bubbles.
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