Respuesta :
The contractile vacuoles of a fresh water amoeba responds with more number of contractions, when placed in sea water.
Contractile vacuoles are the cellular structures involved in the osmoregulation of the organism. These organs show continuous contractions to expel fluids (especially water) out of the body. These are found in organisms like amoeba, paramecium and other unicellular algae.
Amoeba is a unicellular organisms that belong to the kingdom Protista. They are the protozoans and also a brain-eating parasite. They have an irregularly shaped structure with free movement. They engulf their food by the formation of finger-like projections called pseudopodia.
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