So, in order for a birth to occur, there must be a male contributing sperm and a female contributing the egg. Same thing as with pretty much all creatures. Chickens, like most birds, have the whole pregnancy thing happen outside of them rather than keeping the egg inside of their body the whole time. Eggs that hatch have a sperm that fertilized them, while eggs that we eat are unfertilized. Even if there is no male, the chicken still lays eggs.
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