It gives the embryo oxygen it needs to survive in the egg.
Presuming that your question refers to the pores of an eggshell, and the enclosed embryo. The developing embryo requires oxygen for its development, and this is obtained through the pores in the shell. If these pores are blocked, as is done in preserving eggs, then the development will cease. Common preservative techniques include greasing the egg, or immersing it in a silicate solution.
When the baby chicks are developing in the egg shell, they need to breathe. The pores in the egg shell allows an exchange of good air with the bad air. A side effect to this. The pores allow moisture to escape from inside of the egg.
When embryo is in the egg shell,it gets all nutrients from the albumen that surrounds the yolk.But for the intake of oxygen and exhalation of CO2 there are many small pores in the shell which develop as it cools.This is because on cooling the internal material shrinks a bit and develops the hollow spaces.
It is to protect the embryo inside the egg.
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platypus and spinney anteater
Any animal that hatches from a shell comes from an embryo. Actually any animal at all comes from an embryo. But the most common animal you would think of would be a chick.
The developing embryo takes its nourishment from the yolk inside the egg. The embryo doesn't need air until it is ready to break out of its shell.
The shell on an amniotic egg is equip with very small pores that allow oxygen to seep slowly into the embryo so that it doesn't suffocate.
The bird embryo develops inside the protective shell of the egg, using the egg yolk as a source of energy and materials from which it will develop.
To protect the embryo inside it until it is fully grown and can hatch its own way out der
When you peel a hard boiled egg you will first notice that after the shell is a white shell membrane, that is there to make sure the egg does not leak out of the pores. Next you will see the egg whites, this is albumen, a protein and water mix that is there to cushion the egg yolk and IF this were a fertilized egg, would provide water to the growing embryo.