The egg. If you could draw a line between chicken and not chicken (which you can’t really), then it would have been when mummy not-chicken copulated with daddy not-chicken to make baby chicken, who was a chicken (by species) from the moment sperm hit egg (well, just after).
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pegasister commented on :
I always thought about this theory like this:
When the cells were evolving into organisms, would they not have evolved into a chicken, not an egg? Can someone correct me if I’m wrong? Thanks. :3