Question

what are these structures?​

Answer 1

There are three basic types of structures: shell structures, frame structures and solid structures.

Answer 2

Answer:

A tree is a nonlinear data structure, compared to arrays, linked lists, stacks and queues which are linear data structures. A tree can be empty with no nodes or a tree is a structure consisting of one node called the root and zero or one or more subtrees. Trees have three main parts - the leaves, the trunk and the roots. The upper part of the tree with the branches is called the crown. Needles or leaves are the part of the tree that make sugar from air and water.

Explanation:

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