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Hey!
The correct answer is A.1. We know this because any good and controlled experiment will only be successful if one thing and one thing only changes. If there were two or more variables changing, then it’d be hard to collect accurate data and correct/confirm the hypothesis.
I hope I helped!
anabannana49
A.1 is correct because only one thing is changing and if you would change more it wouldn’t be as easy to get your data

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