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
Because all of the nutrients and things needed for the embryo to grow are already in the egg. That’s what the yolk and white of an egg are. As the embryo grows, it basically has an umbilical cord attached to the yolk and the embryo consumes the yolk that way.
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