Organisms don't evolve while they're alive, evolution usually comes about through mutations in amino acid sequences in gametes. If a certain mutation appears to be beneficial, that trait will become more common. So at one point a bird that vaguely resembles a chicken would have laid an egg that would have hatched into what would be recognised as a modern chicken.Magnatek said:No one could effectively explain this if they tried. Even Charles Darwin himself must have had trouble with this question as well.wewontdie11 said:Egg because of science etc, etc, can't be bothered to explain.