Chou is curious about the effect of magnets on how plants grow. He sets up ten pots with alfalfa sprouts. He places strong magnets under five of the pots but does not put magnets under the other five pots.This is an example of which scientific practice?

Chou is setting up a test to find out whether magnets affect plant growth. He changes one condition—placing magnets under five pots—and compares those plants with the five pots without magnets. This is performing an investigation, not collecting or communicating results, because he has not yet recorded or shared what happened.

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