And if you’re lipstick addict then there is not to have wondered at some point in your life, how anyway made (their materials, the method of manufacture, etc.).
As almost all the physical characteristics of an individual, how the hair grows depends on the genetic predisposition. People with curly hair, inherit from their parents. Even if none of the parents has curly hair, it is still likely to carry the child genetic markers for curly hair, who come from their own parents.