today,i have read an acdemic discussion why we should have sex ,and if we can find some proofs from nature.

   to admit ,i was absorbed by the discussion.this is the topic i have not once puzzled why we should have two genders and why we are formed through sex  courses. is there any murky reasones for God  do that?

    First,the discussion was brought up by a view,well-known Red Queen Hypothesis, from the book, Through the Looking-glass,writern by Lewis Caroll,in which ,Alice was told by the red queen ,she would run as fast as she can to stay still.

     This means if your circumstances rev up ,you should have the concomitant accelerating,or you would be  thrown out.And,to this point,our genes just like computers full of unexpected bugs.what we can do is updating from this generation to the next.WE should admit our genes are not perfect and would have bugs as our circumstance changes.So,reluctantly,we have to consummate our next generation's genes by assimilate the opposite gender's.

    Over time,scentists finally found the proof ,the potamopyrgus antipodarum ,at the Alexanderina Lake,in Newsland.This is a kind of bullacta,similar to our mudsnail in shape,but the difference is some of this kind can"clone"themselves,just like some strains having fission.Often you can find some little snails when you open its cap,as the result of its own producing.Such little snails inheriting their mother's complete genes without any changes most live in the deeper place of this lake,while the other group which are participant of sex could live in some shallow places,where various parasites flourish.

    however,some scientists have proved that we have sex not only simply for desire,but also to survive.Just because of appearence of natural enemy,we should change ourself by sex.

    but,this can not answer why we should have completely two kind gender,instand of bisexuality.

    how to say, maybe this is a type of cooperation strategically.