miércoles, 2 de febrero de 2011

Human reproduction





HOW DO THEY REPRODUCE:

First, a woman and a man need to have a sexual relationship. during that process, the man introduces his penis into the woman´s vagina and ejaculate semen, which contains millions of sperms that start a race to reach the ovum, which is ready only during ovulation days. Once the fastest sperm reaches that ovum, it gets fertilized immediately, and the pregnancy process starts. If everything goes right, in more or less 9 months a new baby will be born.

WHY DO THEY NEED TO REPRODUCE:

To perpetuate the species to avoid extinction of our race.

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