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Practical skills answer explanations

Review worked answers and explanations for Practical skills. Aligned to OCR Gcse Biology A Gateway.

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Question 41 of 144

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A student investigates the effect of exercise on ventilation rate. They measure the initial ventilation rate, then the subject performs 5 minutes of moderate exercise, and the ventilation rate is measured again immediately after exercise. What is a crucial control variable that should be kept constant in this experiment?

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