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ARC-Challenge / Mercury_7103530 / A student wants to determine which hand soap kills more bacteria. Her teacher…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

A student wants to determine which hand soap kills more bacteria. Her teacher tells her to change only the type of hand soap. The type of bacterium tested must be the same. Only one variable is tested because it

choices

  • speeds up the experiment.
  • improves the reliability of the results.
  • makes the graphs easier to read.
  • ensures the students learn something.

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