those countries have very high taxes. Ã°â¢The average annual growth rate for the European population from 1985 to 1995 was only. 0.28 percent; in the same period the population of Asia grew by 1.69 percent per year, and. that of North America by 1.33 percent annually.
The life span of sperm after ejaculation depends on the circumstances. Ejaculated sperm remain viable for several days within a woman's reproductive tract or in nutritive liquid (culture medium) in a lab setting. Fertilization is possible as long as the sperm remain alive â at least five days. Sperm also can be preserved for years when semen is frozen. With. Landon Trost, M.D. 1  Secondary infertility. 2  Paternal age.
The volume and content of the ejaculate depend on the length of time between ejaculations. The average volume of semen is 2.75 mililiters(ml) , ranging from 2-6 ml, the higher volumes following periods of abstinence.An average human ejaculate contains about 180 million sperm (66 million/ml), but some ejaculates contain as many as 400 million sperm.Both quantity and quality of the sperm are important determinants of fertility. A man is considered clinically infertile if his sperm concentration falls below 20 million/ml semen.he volume and content of the ejaculate depend on the length of time between ejaculations. The average volume of semen is 2.75 mililiters(ml) , ranging from 2-6 ml, the higher volumes following periods of abstinence.