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...
Diffusion is a physical process that can beobserved with any type of molecule. For example, when acrystal of dye is placed in water (Fig. 4.5), the dye and wa-ter molecules move in various directions, but their netmovement, which is the sum of their motion, is toward theregion of lower concentration.