The theme can be, a man is alone in the cold Yukon with nothing but a dog, and all odds are against him, including nature. A theme is an outline of the story by not getting into details
It is whom. You can only use who if you can replace is with he or she.
Answer:
Flashback
Explanation:
He is remembering an event from earlier.
Yes it is
The little red wagon.
What passages are the ones you are talking about?