What grows inside a fertilised birds' egg?
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Birds reproduce by internal fertilization, during which the egg is fertilized inside the female. Like reptiles, birds have cloaca, or a single exit and entrance for sperm, eggs, and waste. The male brings his sperm to the female cloaca.....
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Hard-shelled bird eggs contain albumen, or “egg white,” and a yolk. The fertilized egg cell, or embryo, develops within the yolk and feeds off of it and the white. ... A bird in an egg doesn't have as obvious a way to take in oxygen and get rid of carbon dioxide, but the egg, again, takes care of things.
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