Hi, I'm Emilie, I'm 12.
Me, wanting to be a future obstetrician/gynecologist (i want my M.D. from oxford in England!) found this very interesting. All I can say is, it's hormones. Hormones can make girls hair curlier, and straighter. It also makes it frizzer, stringy-er, and such. It really can change everyone's hair type and texture.