Principle lipid storage molecule in many organisms.
Fats consist of three fatty acids bonded to a single molecule of glycerol, that is, they are triglycerides.
Fats are ideal compact energy storage molecules because not only to the individual bonds making up fats store substantial amounts of energy but, as an oily substance, fats can be stored in bodies in a relatively unhydrated state so the mass and volume of water does not literally weight down fat stores.
The word oil is used to describe fats that are liquids at room temperature.
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