Waxes are considered to be important to living things, because waxes are a type of lipid. Lipids are energy stored within our body, somewhat like a storage of energy. Lipids, consists of other substances, such as oil, fats and the likes. Lipids store energy, for the cells to consume whenever they need it.
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The answer would be serratus anterior.
Sentence form: The serratus anterior muscle is important in thrusting movements of the arm, much like a boxer's jab punch.