The embryo inside the egg is carrying out cellular respiration. In order for it to do that oxygen must be able to enter the egg and carbon dioxide must be able to leave.
Reptile eggs have shell membranes.
The only reptile with a shell is the turtle. The shell is a unique feature that provides protection and support for the turtle's body. Turtles are known for their distinctive hard shells that are made up of two parts: the upper carapace and the lower plastron.
The leathery shell of a reptile egg is to simply protect the eggs from any predators.
The armadillo is a mammal, just because it has a "shell" that does not make the armadillo a reptile.
Lizards and snakes !
THe shells of reptile eggs is porous - it absorbs oxygen through the membrane.
That would be a turtle !
Tortoise
Turtle.
the inside will come out
A tortoise is a herbivorous terrestrial reptile with a dome-shaped shell. Tortoises primarily feed on plants, vegetables, and fruits, and they are known for their distinctive thick and heavy shell that acts as a protective armor.
These are the noble (inert) gases.