In severe cases, the viral infection causes a high fever, bleeding into the skin, and necrosis (death) of cells in the kidney and liver. The damage done to the liver from the virus results in severe jaundice which yellows the skin. Hence, the yellow in yellow fever..
filter definition: The definition of a filter is something that separates solids from liquids, or eliminates impurities, or allows only certain things to pass through. (noun) A Brita that you attach to your water faucet to remove impurities from you...
Definition of sampling. 1  1 : the act, process, or technique of selecting a suitable sample; specifically : the act, process, or technique of selecting a representative part of a population for the purpose of determining parameters or characteristics of the whole population.