Vacuoles and storage
Why?
Vacuoles are storage sacs: in plants a large one holds water and keeps the cell firm.
A wilted lettuce leaf is put in water and its cells' vacuoles swell up like balloons, making the leaf crisp again.
Press the button to rescue a wilted lettuce leaf and see an amoeba digest food.
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Tiny food vacuoles inside an amoeba each hold a swallowed bit of food that slowly shrinks as it is digested.
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