I read this book last year so take this with a grain of salt.
Gene jumps from the tree to compete with Finny due to the fact that Gene is always trying to do better than Finny. He is put under the grasp of peer pressure due to Finny almost forcing him to do this. Ever since he first jumped Finny kept pressuring him to jump since he thought Gene enjoyed jumping.
Rather than uses this answer you should probably just reread chapters 3-4
Answer:
I’m pretty sure any would work.
Explanation:
She didn't want to be the receiver of memories because they made her very depressed and she felt empty so she asked to be released so she doesn't have to deal with more horrible memories, they made her feel alone and that there was so much sad times. She had to face things she has never felt before and it was too much so death was the answer.