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Within a living cell, the oxygen (O2) from a mixture of O2 and carbon dioxide (CO2) is used up. This creates a concentration gradient across the cell membrane, drawing O2 across the membrane from the outside in, a process known as

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1. Within a living cell, the oxygen (O2) from a mixture of O2 and carbon dioxide (CO2) is used up. This creates a concentration gradient across the cell membrane, drawing O2 across the membrane from the outside in, a process known as





 
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