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A testable question is, “How does the amount of exercise affect heart rate and breathing rate?” Which is a controlled variable?O Amount of exerciseO Heart rateO Breathing rateO Temperature in the room

User Elhanan Mishraky
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1 Answer

5 votes
5 votes

Answer

Temperature of the room

Step-by-step explanation

The room temperature can be controlled compared to all other options.

User Tom Moers
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