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.
For how long after ejaculation in the vagina, can the sperm remain viable? Following ejaculation, the semen forms a gel. This gets liquefied in 20â30 minutes due to the presence of prostatic enzymes in the semen. The ejaculated semen is alkaline in pH and this provides protection for about 2 hours for the sperm from the acidic environment of the vagina. Very active sperm have been found in the fallopian tubes even 5 minutes after semen deposition. Most of the sperms because of their own motility gain entrance into the cervical mucosal folds where they get their nourishment and could fertilize the female egg even 2â4 days after intercourse.