1 Explain why the binary tree implementation discussed in this section has two classes, one for an empty tree and one for a nonempty tree. 2 Explain how polymorphism is used in the binary tree...

1 Explain why the binary tree implementation discussed in this section has two classes, one for an empty tree and one for a nonempty tree.

2 Explain how polymorphism is used in the binary tree implementation discussed in this section.

3 Describe how insertions can have a negative effect on subsequent searches of a binary search tree.