I will two about how does Jack change in the story.

Firstly I will talk about Jack’s Jack’s behavior that doesn’t seem to chance a lot but you can found that Jack behaves bad when he is talking with Piggy and doesn’t care about Piggy and what he said.”His specs-use them as burning glasses!”   “Piggy was surrounded before he could back away”  “Here- Let me go!  His voice rose to a shriek of terror as Jack snatched the glasses of his face”

Secondly I will talk about Jack’s ideas, in chapter two after Ralph has been chose to be the chief Jack decide that he and his choir are going to be the hunters to hunt pigs and get meat “Jack broke in. All the same you need an army-for hunting. Hunting pigs—“.

Also in chapter 2 we can see that the boys were argue about having the right to speak when they have the conch in their hands, for example when they were in the mountain Piggy was holding the conch to speak but Jack told him to shut up and that none care about his ideas. We cans see this almost at the end of chapter 2 when Jack said “Oh, shut up!” and Piggy said ” I got the conch,” said Piggy, in a hurt voice. “I got a right to speak”.