at first, why human being created here (earth) not saturn? not pluto? (dont tell me because earth got oxygen)

second, who created human being?

third, the purpose of human being created? i dont think we birth for work, study, screw girls, screw by boss, buy house, buy car, go clubbing etc..
it must be some purpose that's y we here to achieve

forth, is that in universe that's only human being?

i believe after we know all this secret, then we will know whether got doomsday o not.. it actually related..