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Levels In A Binary Tree
In general, a binary tree with n nodes will have at least 1 + floor(log_2(n)) levels
When we do something like a tree traversal or heap insertion or removal this is why we use a bound of O(h) which for a balanced binary tree really means O(log(n)).
We will traverse at most a log amount of levels in the asymptotic sense since that is our tail behavior. Our asymptotic behavior is logarithmic.