This is something that i think about alot.
#1
Eggs. Reptiles evolved before chickens.
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#2
Eggs. The chickens would evolve from a different animal that also layed eggs therefore would hatch from eggs before today's chickens existed
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#3
Eggs, how do you think the first chicken came into existence?
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#4
Chcken. Its lays the egg, which then becomes a new chicken
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