Mainly because at 15 yrs of age a girl has surly started her monthly cycle, causing her to loose iron in her system resulting in anemia.
Women lose a significant amount of iron each month with menstruation so they need more dietary iron to replace what is lost!
The male is far more aggressive than the female - they are large, and need to assert their dominance over their territory.
to have a chick yes you need a male and a female but if you want the eggs you have for breakfast no you don't need a male
Girls at 15 have hit puberty which means they have hit their periods and they need more blood as they are getting rid of so much everyday.
No, You need a male holly to get berries on a female plant.
You need the right mood for it to happen.
We need more information. How old is the gorilla? Male or female?
Yes, you must have a male and female to breed.
U know female r more selfish than male. After makeing sex female spider thought that she is now powerful for live. No need male spidr. When female spider pregnant they could not go out for food. then they eat male spiders.
the female monk seals weigh more than the male is because they need more nutrition; meaning more food they eat thus making them weigh more
No, you just need a fertile seed. There are no male or female seeds. Some plants have male and female flowers, but the seeds are seeds.
You need to clarify the question. Sex is probably the short answer, but out of context I can't say much more.