Answer:
Carbon
dioxide and water move across a cell by the process of diffusion and osmosis,
respectively. When the concentration of 
is low outside the cell as
compared to inside, it moves out, i.e., from a region of high concentration to
a region of low concentration.
Also, when concentration of water increases inside the cell
as compared to its exterior, it moves across the plasma region from a region of
its high concentration to its low concentration.
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