How long a cardiorespiratory endurance workout session lasts is called:.

Your cardio sessions should last at least 10 minutes at a time. . But the longer you are able to exercise, the more calories you will burn and the more endurance you will build. Aim to slowly increase the duration of your physical activity over time to reach at least 30 minutes of continuous cardio.

Explanation:

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you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.