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Answer: Your brain constantly gets signals from your body which detect the amount of oxygen and carbon dioxide in your blood. Your brain will send signals to the muscles involved in breathing and adjust your breathing rate depending on how active you are.
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Answer:
Burning of a candle
Explanation:
All of the other things cannot be undone. the burning of a candle can. Blow the candle out and you have undone a phisical change
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I believe b. Let me know if it's wrong
the answer to your question is true