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The contractile vacuole allows free-living protists to expel extra water. <b>The contractile vacuole allows free-living protists to expel extra water <br /></b>.
exists and is an alternate of . Your cells ... all cells ... and EVERYTHING that you can define as life happenes because by the actions of proteins in water. Because without any water plants, animals and humans will die. Water lets the plants grow so that we could breath in oxygen and eat some of the plants for food. Water lets animals live so that we could eat the animals to survive. Water is very important to everyday use without any water there will be no life left on planet earth. Your cells ... all cells ... are little bags of water, <br /> and EVERYTHING that you can define as life happenes because by the actions of proteins in water.