How did Buck's success enable Thornton and the others to set out on a new journey? Call of The Wild Chapter 7

This is an acadamical question why does juelz get bit by an alligator and why was arthur the only one who in the middle chapter in the book

How can you tell that the text is from a biography

Which trait is common to the narrators in these excerpts? a the narrators were born in poverty the narrators were separated from their birth parents c. the narrators grew up to be criminals d the narrators worked hard in lide to improva their ocial status the narrators blamed themselves for their mistortunps