Answer: Define Active transport
Explanation: The moving of molecules or ions across the cell membrane.
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1, heartburn. Keep stomach acid in the stomach!
Answer:
respiration is a process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances.
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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