Embryo
Until they hatch Only fertilized eggs hatch. Also a fertilized egg would not last on the counter, as it would spoil. It would have an embryo. A non fertilized egg, (no rooster) can last 3 or so weeks non -refridgerated. If in doubt, do the float test.
in-vitro fertilization
No, you are not pregnant then. It takes about 3 days for the egg and sperm to meet and for the egg to be fertilized and then another week until the egg has traveled down to the uterus an got attached. The test will not be reliable until 2 weeks after sex the earliest.
About 3 weeks.
identical twins, if the egg divides in 2; identical triplets, if it divides into 3, and so on...
This question is ambiguous.If you want to know what the technical term is for a mother hen sitting on her egg, that would be incubation.But if by 'term' you were asking how long the incubation period lasts, fertilized chicken eggs hatch in about 21 days (3 weeks).
After three cell layers develop, the fertilized egg is called a gastrula. During this stage, the three primary germ layers—ectoderm, mesoderm, and endoderm—form, which will eventually give rise to different tissues and organs in the developing organism. This process is part of embryonic development and is critical for proper organ formation.
Implantation bleeding typically occurs around 6-12 days after conception as the fertilized egg attaches to the uterus. Bleeding 3 weeks after intercourse is unlikely to be related to implantation. It is always best to consult with a healthcare provider for any abnormal bleeding.
up to 3 weeks and then a head pops out and it starts to eat its egg.
only one sperm can enter an egg (first come first serve) only one egg can be fertilized at a time Actually 2 or more can but the baby won't make it to birth. My daughter died at 16 weeks. I had the baby tested and she had been fertilized by 2 sperms. I agree with this answer. I recently had a miscarriage and had the tissue tested. It turned out that 2 sperm had entered the egg at the same time and fertilized it, which results in the baby having trisomy of all chromosomes(3 instead of a pair). You can be pregnant and the baby will develop until a certain point before it miscarriages because it is not compatible with life, my miscarried at 9 weeks. It is a totally random fluke event. I am pregnant again and things are going great and I am in my 12th week. Good luck!
Your question does not make total sense. If stored correctly, eggs will hatch after storage for 3 weeks from being laid. depending on species, eggs are fertilised 1 day to a few weeks before being laid.
The same way any mammal reproduces. The male mounts the female, sperm is ejaculated into her vagina, and the egg(s) are fertilized. For dogs, gestation period (the time it takes for a puppy to develop from a fertilized egg) is about 3 months.