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ARC-Easy / Mercury_7146178 / Lea is investigating how phosphates affect oxygen levels in pond water. For part…

Problem

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question

Lea is investigating how phosphates affect oxygen levels in pond water. For part of the investigation, she uses pond water that contains no phosphates. The pond water without phosphates would be what part of the investigation?

choices

  • conclusion
  • hypothesis
  • control group
  • experimental group

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