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Question #1
Doubly-linked lists required less complicated programming code than singly-linked lists.
Question #2
An extra pointer in each node that points to the previous node allows traversal in each direction of a doubly-linked list.
Question #3
The first node created in a circularly-linked list must always serve as the head of the list.
Question #4
A circularly-linked list is like a singly-linked list with one exception-the last node's next pointer points to the beginning of the list.
Question #5
Each node in a circularly-linked list has a null pointer.