Does It Matter? but there are little holes in the egg
They eat, or absorb, the yolk of the egg.
The bird inside an egg can die, yes.
No, they do not need a uterus. The chicks develop inside of the egg instead of inside of their body.
so that the chick can get oxygen while its developing
From the eggs we eat, there are chicks inside the egg. (the yellow part) Believe it or not, sometimes there are two chicks in one egg! One time my brother opened a hard boiled egg that had two small yellow circles.
As soon as they can afford Two Men & a Truck.
They peck at the egg from the inside, all the way around, and then push with their legs until the shell separates.
Yolk is good food containing much of what a chick needs, it is after all what the chick grew from inside the egg.
15mm
No. All fetuses start off as a cell which is called an egg. But human babies are not inside an egg like baby chickens are when chicks are born. Human babies do not need a shell, because the mommy's belly gives the fetus protection for the entire time. Chicks must grow inside the egg shell but outside of their mommy's belly.
The chicks lungs and heart are fully developed by day 18. The lungs draw in air and the heart circulates oxygen laden blood throughout the embryo. The inside of the egg shell has enough air to sustain the chick for the next 3 days. The egg shell is porous and allows moisture to escape and air to enter.
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.