Choose all that apply.A concentration gradient is exhibited when A)the room temperature is 34 degree Celsius and the outside air is 34 degrees Celsius. B)intracellular fluid has 5% solute and extracellular fluid has 0.8% solute concentration. C)during rest,muscle and liver cells contain high glycogen concentration and blood contains lower concentrations. D)the pCO₂ changes from 45 to 35 mmHg in the alveoli of lungs.

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A concentration gradient exists when there is a difference in the concentration of a substance across a space. B, C, and D all describe scenarios where there is a difference in concentration of solutes or gases, indicating a gradient.

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