Final answer:
Amos was helpful to Jack and Auggie during the nature retreat by introducing Andy to other kids, supporting his musical practice, and providing emotional support for his homesickness.
Step-by-step explanation:
During the nature retreat, Amos was helpful to Jack and Auggie in several ways. Firstly, he introduced Andy to the other kids and helped him make friends, which made Andy feel more comfortable and included. Additionally, Amos supported Andy in practicing his music regularly, which resulted in him becoming one of the top students by the end of camp. Lastly, Amos recognized that Andy's bad behavior was due to homesickness and offered support and friendship, helping him feel better and adjust to camp life.