Ralph gives the boys a speech. He's pointing out that the boys aren't working together as a team and are no longer happy 

The boys argue about the possibility of a beast on the island. Jack doesn't think there's a beast 

Jack starts to question Ralph's role as leader of the group. He thinks he does the most by being a hunter a providing food 

Jack is confident that he and the hunters can hunt down the beast, if it exists 

a shell you can blow into for music or loud sound

trees/plants that grow along the 

a huge dent in the ground created by the airplane crash 

a stretch of salt water separated from the sea by a low sandbank or coral reef.