well you see u can tell by seeing if it will hatch by putting it in a box at a 95 degree lamp facing the egg then 18 days later (maybe) u will here chirping and tapping if u don't keep waiting but after a week after 21 days it is not fertilized. so there u go, oh and p.s. there is a chance that an egg from the store can be fertilized! ;)
It was know for farming because Fertile means farmland
If you assume she is fertile, you will have very few problems.
Here is what i know some of it i forget, it provided fertile crops.
Fertile eggs
if you have your period, than no.
Two weeks after your period
You could take to a lab or a vet they have these special machines that can tell if its fertile or not
The Fertile Crescent
Infertile eggs will go white within 36 hours. The fertile ones stay amber (clear).
because i am that awesome, that i was there then
what the is wrong with you get off this website
well i dont know