Vacuoles are membranous sacs that are part of the cytomembrane
system. Vacuoles occur in different shapes and sizes and have various
functions. For example, some single-celled organisms (e.g.,
protozoa) and sponges have contractile vacuoles that collect
water and pump it to the outside to maintain the organism’s internal
environment. Other protozoa and sponges have vacuoles for
storing food.
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