[editor-surveyor]

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CO2 is what raises your pulse rate, but lack of sufficient O2 is the cause of the high CO2.

It also is a common cause of death.
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[jetson]

CO2 is what raises your pulse rate, but lack of sufficient O2 is the cause of the high CO2. It also is a common cause of death.

Or the lack of breathing that traps the used oxygen in your lungs