The Biology of Pregnancy . The beginning of human life has inspired wonder and curiosity in scientists and lay persons alike. There is evidence that in prehistoric with the birth of a baby. As a result , many theories of a mystical son grew up to explain birth. The Greek Philosophers and Physicians, on the other hard were aware that sexual intercourse always preceded pregnancy though they did not know exactly how this led to the production of a new life. On the basis of their knowledge they evolved the theory that the woman was the receptive soil in which the seed from the male was planted. It was not until the seventeenth century that the period degrade a Ducth physician, suggested that the woman supplied an egg. A few years later, a Dutch spectacle maker , Van Leerwenhock, reported that Little animals , or what are known as sperm cells, were contribution to the new human being. How Human Life Begins ...