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A scientist is doing an experiment. She wants to find which of the following

treatments is the best way to break down sewage waste. She will test a chemical,
Bacteria X, and Bacteria Y.
What should she use as the control group for this experiment?

A. sewage treated with the chemical

B. sewage treated with Bacteria X

C. untreated sewage waste

D. sewage treated with Bacteria Y

User Yaro
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1 Answer

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ANSWER:

She should use untreated sewage waste as the control group for this experiment.

Step-by-step explanation:

  • In any experiment, a control group is the independent or isolated group that cannot affect the "outcome of an experiment".
  • In this experiment, untreated sewage waste is the control group because untreated sewage wastage cannot affect the outcome of the experiment.
  • The sewage waste is being treated with a chemical, bacteria X and bacteria Y all of which will have an impact on the result of the experiment.
  • Only untreated sewage waste will not impact the outcome of the experiment.
User Peterhil
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