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A pair of contractile vacuoles.

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What is a structure built across the water to hold water back?

A dam is a structure built across the water to hold water back.


Why do Paramecium need to remove water?

The simple answer is osmosis. Osmosis is the movement of water from a dilute solution to a more concentrated solution through a semi-permeable membrane*. Any animal in freshwater has a higher concentration of dissolved substances in its cells than the surrounding water. A Paramecium is enclosed by a semi-permeable cell membrane, which lets water in but prevents most dissolved substances leaking out. Under these conditions osmosis will occur and the cell will gain water. To prevent itself swelling up and bursting Paramecium has a contractile vacuole, a structure in the cell which fills up with water and periodically expells it back into the surroundings. * The semi-premeable membrane is also called partially permeable or selectively permeable, which all mean basically the same thing.


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What method of locomotion do paramecium use?

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it is a dam that holds back water and it blokes the water like lakes,rivers and the ocean.


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Paramecium have hair-like structures on the outside of their body called?

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Water is moved to the top floors of high buildings via pumps, which lift the water in stages. We may also see check valves, which prevent the water from flowing back down the pipes. The pumps will be placed at intervals up through the building so that one pump doesn't have to develop all the pressure necessary to lift the water all the way to the top. The lifting of the water is done in stages with pumps.


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