WHY DO WE HAVE TO DIE?

Every human being one way or the other is expecting his big day,the unfortunate day he/she will depart from love ones and friends.he is either crimated or burried.whatever the mode of burrial ,the person just have expired from this world.as sheik Almoravid stated''his world is finished,he has withinessed his dooms day''.we the living keep on worrying ourselves about when the ocean layers will finally colapse,natural desasters will become prevalent,when some alians will invade us .but the dead will never come back.no scientist can bring back a dead and burried person.the dead slowly get forgoten by friends ,then love ones,once in a while we remember them fundly .but we cannot be with them.we the living imagine ,what is like to die ? what happen during that process of the organs giving in to the unseen power or force taking effect on our organs ? we only read medical journals and some sceintific analysis ,but those explanations cannot solve the problem of excaping death .who is that can avoid death ? i read with keen interest the amount of fortune amassed by people like david rogafela ,nathen rothchilds ,onasis and the many more billoinairs who passed away.powerful men too die .from flanbouyant heads of state to dictators,they all die ,from strong will leaders like reagan,yaser arafat ,abdul nasser all of them are dead .the hard face dictator like sani abacher is also no more .who do we answer to after all our crime spee whilst living ? do we go just like that unaccount ? what about the leaders with excutive powers who authorise the leveling of certain country's infracstures ,do they too just die without any sort of account ? it baffles me.the key question is WHY DO WE HAVE TO DIE ?.muslims are told that ''death is a test for them'' a sign of the human limitations .after death the creator takes account of his creation ,the human .but then the reason we die is very puzzling .