Typically, a woman of childbearing age should menstruate every 28 days or so unless she is pregnant or moving into menopause.
NO
Menstruation
No, clearly it's not possible for a woman to menstruate while pregnant.Menstruation is the process of the uterus lining shedding as a result of a woman not falling pregnant. A woman can bleed during pregnancy but she will not menstruate.
fertilization
Yes absolutely and often you have cravings and eat more because the body is preparing for a baby. You can live completely normal even when you menstruate.
No, it's biologically impossible for a woman to menstruate while she is pregnant - a woman will only menstruate if she doesn't get pregnant during the last cycle. A woman can bleed during pregnancy for various reasons but this is fairly rare, chances are if you're menstruating you're not pregnant.
It depends on whether or not her uterus and cervix were removed, if so then no she should not menstruate.
Yes. It takes about 200 to 300 calories for a woman's body to menstruate.
No. Menstruation is the shedding of the lining of the womb. No womb, no shedding.
About once every 28 days. However, there may be differences between one woman and another, and between one period and another for the same woman.
No; a man can't get HIV from a healthy woman (by healthy I assume you mean HIV free). A woman (or man) can look healthy, but be infected with the virus.
A nine year old may get her period, but I'm not sure what you mean by sooner - sooner than what? A woman will only start to menstruate when she is due to menstruate, the menstrual cycle cannot be sped up or puberty sped-up to menstruate for the first time before you're ready.