Many single-celled animals, living in fresh water, possess vacuoles which contract regularly, expelling excess water.
Why do the cells of plants living in fresh water not require such vacuoles?
1 )
Plant cells have a higher concentration of dissolved solutes than animal cells.
2 )
Plant cell walls are impermeable to water.
Plant cell walls limit cell size.
4 )
Water movement into plants is controlled by their roots.
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