Answer: 1. The little prince is afraid that his rose will not be able to protect herself, so he must return to his star. He is afraid that his sheep might eat his rose. He is also afraid that the snake might not be reliable-- maybe the venom might not be strong enough and he may suffer, or the shake might also bite his friend, the pilot.
2. The little prince does not want the pilot to come back tonight because it is the anniversary of his descent to Earth, and tonight he must return, but can't take his body, so he will allow the snake to bite him. He does not want the pilot to see that.
3. The snake bites the little prince on the ankle.
Explanation: The Little Prince seems to be a short children's book, but it is a very complex story about human nature, love, friendship, and how to find meaning in simple things in life. Chapter 26 is the climax, and full of emotion as the pilot realizes that the little prince must leave him, and the memory will be with him forever.