Well one way is if a European travels to a different culture then comes back to Europe and spread the culture to the European culture another way is if someone out of the European culture came in the European culture with their own culture and spread it to other Europeans which would affect the European culture
Well teens can have it and not know it cause of there parents but thats rear and some teens can get it cause we have more then one sexual partner. so to help prevent the spread by using condoms.
Example:
For all the right reasons, a person wants to start going to the gym but their parents can't be easily convinced since it costs a pretty penny and doesn't seem to figure out why's it necessary for their son/daughter to go to the gym right away. A person that's in terrible need to do it starts persuading parents into realizing that workouts are good for the overall wellbeing of mind and body and will be quite useful for better concentration in school, increasing energy, reducing the risk of chronic disease and is good for health in general.
Eventually, the parents will see all the benefits of it and will be easily persuaded because they'd do all for the wellbeing of their child.
Answer: because that’s what people do when people make fun of you!
Explanation: