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How can turtles breath under ground when they hatch from their eggs?

When the turtles are in their eggs their receiving oxygen though the contents inside of the egg. Once they hatch it doesn't take them long to dig out. On top of this, because sea turtles need to be able to hold their breathe for a long time to dive, they have a lot of red blood cells which hold in oxygen so that they would be able wait to breathe until they hit the surface.

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