Réponse :
1) a nuclear war destroyed the world and made people have to live on a station called the Ark.
2) there were too many criminals on board so the authorities decided to send 100 young criminals down to earth to see if it could be lived on.
3) the 100 are the people sent down from the ark. their mission is to see if the Earth is habitable.
4) they discover that they are not alone and have to survive in a hostile environment.
