Read the sentence: "Scientists carried out a controlled experiment to test how light affects plant growth." Which option best defines a "controlled experiment"?
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Doğru cevap: A
In a controlled experiment, scientists change only one variable and keep the others constant. This helps them see the real effect of that variable.
- Çözüm: In a controlled experiment, scientists change only one variable and keep the others constant. This helps them see the real effect of that variable.
In a controlled experiment, scientists change only one variable and keep the others constant. This helps them see the real effect of that variable.