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While fat and oil lipids have three fatty acid chains joined to a glycerol molecule, phospholipids have two chains joined to the glycerol with a phosphate group, which you might have guessed from the first part of this lipid type's name. Phospholipids are the main constituent of cell membranes.
Lipids are mostly made up of Carbon and Hydrogen atoms. They also contain some Oxygen atoms. Lipids are formed when glycerol molecules combine with fatty acids(compounds). Each Lipid has a different structure even if the difference is very small. They belong in 3 different categories: fats, oils, and waxes. Lipids can be saturated or unsaturated. Saturated is fatty acids in the state of having the highest number possible of hydrogen atoms. If there is one or more carbon-carbon double bonds in the fatty acid, then it is unsaturated.