A person's blood type is based on the antigens found in the blood. These antigens, A and B are found on the surface of the blood cells and are uses as markers in the body. Type O blood does not have A or B antigens on the red blood cells, but contains both types in the plasma.
The Karst Plateau or the Karst region (Italian: Carso; Slovene: Kras), also simply known as the Karst, is a limestone plateau region extending across the border of southwestern Slovenia and northeastern Italy.he Karst Plateau or the Karst region (Italian: Carso; Slovene: Kras), also simply known as the Karst, is a limestone plateau region extending across the border of southwestern Slovenia and northeastern Italy.
This type of topography indicates that water is close to soluble bedrock such as limestone, dolomite, gypsum and rock salt. Karst topography is found throughout the world; in the U.S. it is particularly important for mapping large cave formations such as Mammoth Cave and the Fisher Ridge Cave System in Kentucky, Jewel Cave and Wind Cave in South Dakota, and the Friars Hole System in West Virginia.