The external body, fertilization is one of the most imitated nature is to release to natural selection. Doyosuchi strong as it can be made with egg fertilization. This is one way to make the child a glass tube. Suitable for people with infertility problems that it is not severe.
The fertilized outside the body and form. Nearby are the most natural is to let natural selection. The most healthy sperm can only be fertilized with eggs. This method is an alternative to IVF. For those who have infertility problems are not severe.
A frustum outside the body form. Nearby, the most natural, is to let the natural selection By the strongest spermatozoa only can the conceived with the egg.Suitable for those with problems of infertility that not severe .