Answer:
Mom decided to split the prize between my brother and (I).
Explanation:
As there is only two entities (in this case, two people, you and your brother), between would make the most sense. Among can be used in such a state, but it is generally used when there is either more than 2 persons or more than 2 groups of people.
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Answer:
Internal conflict is when a character struggles with their own opposing desires or beliefs. It happens within them, and it drives their development as a character. External conflict sets a character against something or someone beyond their control.
Explanation:
The answer is a simile. This is because similes compare two things (these things here are his life and the dusty yards) by using like or as (specifically here as).
The other ones don't make sense: nothing is being over exaggerated (hyperbole), there are no repeating consonants (alliteration), and there are no human characteristics being given to inhuman subjects (personification).