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Does a baby chick breathe inside the egg? How?

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Does a baby chick breathe inside the egg? How?

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Yes it does. An eggshell may look solid, but it actually has about 8,000 pores that are large enough for oxygen to flow in and carbon dioxide to flow out by pumping pressurized air into an underwater egg and watching thousands of tiny bubbles appear on the surface. The head of a chick develops at the large end. About three days before hatching, a baby chick punctures the air cell at the base of the egg with its sharp egg tooth (a tiny, horn point on top of its beak) and breathes the first gulp of air: still inside the egg. As soon as it can breathe, it can peep. We can hear peeping and tapping as it methodically chips a hole in the egg.

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