It's known to have happen that when several women or girls live together they start to have the same cycle, yes.
It is their menstrual cycle period.
MENSTRUAL CYCLE
Any change of diet,exercise , a multitude of things can change your cycle. Your environment will decide for you how your cycle will go. Ever heard the mother and all her daughters were on the same schedule? Collegedorms- girls that are around each other for the majority of their time in the same living environment are predictably on the same schedule after living together for a few months
There is no cause.
Some girls do, some girls don't. It depends on the girl.
Girls start their menstrual cycle when they grow public hair and develop breasts. When you spot white stains in your clothing that's when you've begun the cycle. If you'd like to avoid these markings in your undergarments start wearing pads.
Girls do not have cherries, a cherry is a type of fruit not a part of female anatomy, and nothing pops. A girls menstrual cycle will only be changed by hormonal changes in the body, things such as ill-health or stress can also impact on the cycle by delaying or causing her to skip ovulation.
The uterus is near the stomach and during the menstrual cycle the uterus becomes inflamed and women usually experience menstrual cramps.Due to the close proximity of the stomach digestion can also be painful
purberty for girls around whenever they're in 6th grade
It depends how old you are.
menarche; 12
most girls get it between the ages of 8 and 13 but if you still have not had it after you are 13, talk to your doctor.