Bird eggs are built with 100s to 1000s of pores so the embryo can breathe
Bird eggs are built with 100s to 1000s of pores so the embryo can breathe

The pores in bird eggshells allow oxygen to enter, and carbon dioxide and water vapor to exit. The embryo receives the oxygen via diffusion into the chorioallantoic membrane, which is full of blood vessels and lies just inside the shell.

Watercolor, ink, and paint pen on paper. 6”x6”.


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