Respuesta :
Answer:
The length of the menstrual cycle varies from woman to woman, but the average is to have periods every 28 days. Regular cycles that are longer or shorter than this, from 21 to 40 days, are normal.
Explanation:
The length of the menstrual cycle varies from woman to woman, but the average is to have periods every 28 days. Regular cycles that are longer or shorter than this, from 21 to 40 days, are normal.
They are when your egg doesn't get fertilised and then it dies and comes out as blood you get it once a month and you lining them has to build back up