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Explanation: The group in a molecule responsible for its characteristic reactions, e.g. amino, carboxyl, hydroxyl, etc. groups
or de pousse apicale (this applies to botany) = The terminal, i.e. topmost shoot, characteristic of the growth of certain plants or trees. Forked growth, i.e. the development of 2 (double leader) or more leaders (multiple leaders) is often the result of injury.