Because those words are what we call the beginning and ending of the reproductive phase of a woman. You might as well say "Why does life begin at conception and end at death?"
The lower end of female reproductive tract in pigs is not very different from humans. The reproductive system is conserved across all mammals.
The reproductive structures on a beetle are typically located on the abdomen. In males, the reproductive organs are usually found at the end of the abdomen, while in females, they are located nearer to the middle of the abdomen.
A sign of reproductive maturity is the start of menstruation in females.
hormones
Estrogen
epithelium
No
Ovulation.
The epididymis is a male reproductive structure that is responsible for storing and maturing sperm. Females do not have an epididymis, as they have different reproductive anatomy. Instead, females have structures like the ovaries and fallopian tubes for their reproductive processes.
sperm
reproductive