Solution:
Contractile vacuole is absent in Entamoeba because the medium around it (in host's colon) is isotopic to its cytoplasm, so there is no need of osmoregulation. Amoeba which lives in freshwater has contractile vacuole.
Entamoeba differs from Amoeba is not having
Contractile vacuole is absent in Entamoeba because the medium around it (in host's colon) is isotopic to its cytoplasm, so there is no need of osmoregulation. Amoeba which lives in freshwater has contractile vacuole.