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How do substances like carbon dioxide \left ( CO_{2} \right ) and water \left ( H_{2}O \right ) move in and out of the cell?

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Answer:

The movement of gas CO_{2} across membrane takes place by diffusion. It does not require any energy as motion of molecules takes place from region of its higher concentration to lower concentration.

Movement of water is by osmosis which is driven by water potential gradient across a membrane.

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