Answer:
As for the fire going out in chapter 2 the boys build a fire that is too big and it grew out of control threatening to destroy a good part of the island in their frenzy they piled too much wood onto the fire which eventually collapse upon its self.
Explanation: lord of the files
Because it prevents them from breathing, since the ant is blocking off their airway.
D- postmortem
I think thats the answer..