system
Given the following post, respond as if you're commenting on Reddit:
human
Chicken in the egg- how do they get oxygen?

How does the chicken breathe inside of the egg before it hatches without suffocating?
gpt
diffusion through the shell - is is not impermeable to air

to kill the embryos/prevent them from being viable, a process known as egg oiling can be used. this involves coating the egg with an air impermeable film (oil), which prevents the chick from growing normally.