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I haven’t understood how this question seems difficult to so many. Not trying to put anyone down, but chicks hatch from eggs. In order for a chicken to be classified as a chicken (as we know it to be), it would have hatched out of an egg.
To expand on this: mutations between generations happen exactly there, between generations. So the parents of the “first” chicken (if you draw the line somewhere on the evolutionary scale) were not chicken; the egg however was a chicken egg, as it contained a chicken.
Exactly. Well put.