Mammals produce ATP by anaerobic and aerobic respiration. The effect of exercise intensity on the lactate concentration in human blood was investigated. - An athlete and a non-athlete performed the same exercise at the same intensity for three minutes. - Their blood lactate concentrations were measured as soon as they finished exercising. - This was repeated for different intensities of exercise. The diagram shows what happens to the lactate following exercise. Which row shows the molecules in this diagram? (1)

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