An estimated four in sexually active adolescent females between then ages of 14 and 19 have an std

An estimated four in sixteen sexually 'active adolescent females' between the ages of '14 and 19' have an STD.

Explanation:

According to the studies carried out by the 'American Academy of Pediatrics', it is clear that the most common sexually transmitted disease in adolescent females is that of 'human papillomavirus' and about four of every sixteen women, or one in every four women is infected by it. The females between 14 and 19 years of age are vulnerable to this infection because their cervixes are not fully matured.

Cultural convergence is the theory that two cultures will be more and more like each other a very notable example of this is around the u.s.-mexico border, where 

You will lose your drivers license along with your license plate.