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Why does the unterus lining thicken?

Because if the egg is fertilised, it implants into the thick uterus lining. If it wasn't thick, there would be nothing for it to implant into. Also, once the egg is fertilised and is implanted there, it provides protection around the egg


How are embryos made?

Embryos are created through the process of fertilization, which involves the fusion of a sperm cell with an egg cell. Following fertilization, the resulting zygote undergoes cell division to form an embryo. This early developmental stage eventually grows into a fetus and then a fully formed organism.


What each organs of the body are egg cells produced?

The ovary, the female has two and it travels down the fallopian tube (oviduct) and is fertilised in the Fallopian tube. Hope this helped


What happens to leftover sperm when the egg has been fertilised?

After fertilization, most of the leftover sperm are blocked from entering the already fertilized egg by a protective barrier. The sperm cells that do make it through generally don't contribute to the genetic material of the embryo.


What would happen if two eggs were released at the same time but only one was fertilised. What would happen to the one that was not fertilised?

I don't think that would happen, because if both were released at the same time then the sperm would already be in the area, in order to fertilise the one egg. But the other egg would hardly be ignored. However, if it was, I think it's sage to assume it would either hang around until the other child is born, or be absorbed by it to create new cells. I think that the egg which was not fertilised would degrade. However, if it was kept for a long time, than it would probably die in the females body.