For the chicks in the eggs to develop and hatch properly, the eggs must be kept warm. The chicken's body heat keeps them warm. If the eggs are taken away from the hen and still meant to hatch, they are kept in an incubator to maintain the right temperature. If they aren't meant to hatch, the are refrigerated. This stops the development of the chick. Supermarket eggs aren't usually fertilized so there isn't a chick to develop, but they are still refrigerated to keep them fresh.
If the egg were not kept warm, (and turned over occasionally) it would not hatch.
yes
Sometimes, she will usually wait to sit when there are many eggs.
A hen will go "broody" at anytime during her egg laying years. Not all hen do and some breeds are just naturally brooders. To ensure at least one brood hen in the flock you might consider getting a Cochin or a Silkie hen as these two breeds are good brooders. There is no way to force a hen to sit on eggs.
No. The rooster has relations with the hen and she lays fertilized eggs
If the hen has eggs, she is trying to protect them.
Hens will not sit on eggs unless they are "broody" - which is when they are actively attempting to incubate a nest. Hens will not just sit on every egg they lay.
A hen is older than an egg. *A hen comes from an egg. Either a hen or an egg can be older than one another.
we get a hen in a egg
both
The hen LAYS on the egg
what is the size of the egg layed by hen
It could be both if the hen was born first who made the hen (don't say Jesus!) if it was the egg who laid the egg