Question

Question 1
How do substances like $C{O}_2$ and water move in and out of the cell?

Answer 1

Substances like $C{O}_2$ and water move in and out of a cell by a process called diffusion, which takes place from a region of high concentration of solute to a region of low concentration of solute. When the concentration of $C{O}_2$ and water are higher in the external environment than that inside the cell, $C{O}_2$ and water move inside the cell. When the concentration of the solute outside the cell becomes low and it is high inside the cell, the movement happens outwards.