To Kill a Mockingbird quotes help?

Question

“Jem had discovered with angry amazement that nobody had ever bothered to teach Dill how to swim, a skill Jem considered as necessary as walking”

can someone help me to ellaborate on how that quote shows how he is masculine because athletics and otudoors are important to him, like throughly describe the quote. and how he is growing into a young man

2 SENTENCES.

Answer 1

Ten years old when the book begins , Jeremy "Jem" Finch acts as Scout's playmate and protector.  

Entering adolescence during the course of Mockingbird, Jem matures as he struggles with issues of racism and intolerance.  On the brink of manhood, Jem goes through phases as he comes to grips with his family's past and his future role in society.  Sometimes moody and sullen, sometimes kind and gentle, Jem emerges as a leader as he helps Scout understand how to get along in school and reminds her to respect Atticus and their other elders.