In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?," why does water leave the cell by osmosis after the active transport of chloride ions out of the cell by CFTR?

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When chloride ions are actively transported out of the cell by CFTR, the external environment becomes hypertonic relative to the inside of the cell. This means there is a higher concentration of solutes outside the cell than inside. Water moves towards the area of higher solute concentration by osmosis, leading to water leaving the cell to balance the solute concentrations.

In the Section "Investigating Life: Does Natural Selection Maintain Cystic