If a storm breaks off the top of a tree, within a year or two, one of the lower branches will grow upward and become the new tree top, while inhibiting other branches from doing the same. This is an example of

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Apical dominance is the phenomenon where the main, central stem of the plant is dominant over other side stems; this is often due to the presence of auxins, which inhibit the growth of lateral buds. When the top of a tree is removed, a lower branch can take over as the new leader, demonstrating apical dominance.

If a Storm Breaks Off the Top of a Tree