Answer:
carbon-12, potassium, and argon
Explanation:
I'm pretty sure that's the correct answer.
The answer is that they are less likely to have a modern lifestyle because people who live in the interior regions are likely to follow their traditional lifestyle in means of having to live through their traditions and disregarding other lifestyle such as the modern that does not define their culture.
It was once a body of water there, having the shell in the rock means that a sea creature lived there so there must have been water there at one time in history.
I think there are 118 European islands.
