It is the central nervous system that takes charge of the body's involuntary functions outside conscious awareness. It is this system that is responsible for all of the body's involuntary acts, such as breathing, blinking, etc.
They release the gas Oxygen.
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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