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For any bird,  it is the Egg which came first.  Egg is evolved into its shape now.  Perhaps after millions of years / thousands of years ago the  cosmic radiation, sunlight and atmospheric conditions along with the Inorganic and organic contents (minerals and vitamins etc)  have combined constructively to form an egg.

A grown up  bird can only be a consequence of growth in some years of a new born baby chicken coming out from an egg.

An egg was formed by chemical combination and favorable reactions.

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Dont konw the correct ans.... but some years back i had read in some book that the hen came first..... it said that there is some kind of protein or something that creates the egg shell ............. sorry if it is worng or something :)
i think it is hen because even we do landed on earth as baby
yeah that is right