Answer:
Elaborate on how two mostly unlike things are alike.
Explanation:
An extended metaphor is the use of metaphor to compare two dissimilar things throughout a poem or story.
Therefore, what a poem must do to develop an extended metaphor is to elaborate on how two mostly unlike things are alike by using comparisons.
Answer:
If I remember right yes they do
I would have to say formal, mainly because I looked it up on google.