1 to 2 years after puberty not neciserily for all girls it also happens once a month
Periods are the shedding of the uterine lineing when an egg is not fertilised.
They can occur on any day of the month.
yes
during the menstrual cycle
Warm interglacial periods occur every 100,000 years in earth's climate. We are in one right now.
no
no
all periods
No.
no
yes around 11 days after
Periods occur each month not each day Periods last a minimum of 5 days and can range to 7 days.