How do freshwater amobas get rid of excess water?

Freshwater amoebas expel excess water primarily through a structure called the contractile vacuole. This organelle collects excess water that enters the cell due to osmosis, as the amoeba's cytoplasm is more concentrated than the surrounding freshwater. When the vacuole fills, it contracts and expels the water outside the cell, helping to maintain osmotic balance and prevent the cell from bursting. This process is crucial for their survival in hypotonic environments.