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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
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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 Jon Smark
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Answer

Temperature of the room

Step-by-step explanation

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

User Kaptah
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