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A wax is a simple lipid which is an ester of a long-chain alcohol and a fatty acid. The alcohol may contain from 12-32 carbon atoms. Waxes are found in nature as coatings on leaves and stems. The wax prevents the plant from losing excessive amounts of water.
Waxes are like fats in that they are solid at room temperature. This solidity is due to the high degree of saturation, but waxes tend to be used for functions other than energy storage, like waterproofing leaves and fur (baby seal time again !), or making floors shiny. The second kind of lipid is a phospholipid.