How can non-mammals that hatch from shells survive while they don’t have an umbilical cord connected them to the mother and sustaining them?
In: Biology
Short answer. They do have an umbilical cord of sorts.
If you ever broke open an egg with a developing chicken inside you’d note that it’s digestive system is directly connected to the yolk sack.
That’s what eggs basically are, a ball of all the nutrients a developing embryo needs to grow until it hatches.
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