Because of the requirement that we be able to traverse up the tree after an insertion, it is necessary for the nodes in a heap to store a pointer to their parent.

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A heap is a tree-like data structure that stores data in a way that allows for efficient retrieval of the maximum or minimum value. In order to maintain the heap property, it is necessary for the nodes in a heap to store a pointer to their parent. This allows the heap to be traversed up the tree after an insertion, so that the heap property can be restored.

Because of the Requirement That We Be Able to Traverse