According to scientists and evolutionists, the reason why the sperm or the seeds of reproduction are so familiar from almost all species in the world are the same is because it started from one ancestor some 600 million years ago. A few years ago, and ever since scientists started becoming curious as to whether the male reproductive seed originated from one ancestor or is a result of several stages of evolution, many scientists voted that the sperm was a result of batch evolutions.

This is because they could not find a common gene among all sperms of all species. Now, however, they have discovered a gene in all sperms which they called the BOULE. This gene can be found in all insects and mammals, and according to scientists, this can be a breakthrough discovery into understanding the infertility of some males.

Furthermore, according to medical scientists, the gene called DAZ is responsible for the fertility of species. Specifically, two forms of the gene the BOULE and DAZL found in humans and other species, is responsible for this feature. Upon investigating a database of other animals, they found out that some form of these genes can also be found in almost all of them.

The only animals that apparently did not contain a form of these genes are the very ancient animals, including sponges, and fungi.