B) Cultural groups may be isolated and thus become more distinct.
This is because traveling over mountains can be hard or dangerous which will result in little long distance travel and in result little interaction with other groups
OKAY SO, do you have any more info?
Answer:
The earth is the common home of so many species of animals and plants that exists. It is the only living planets among the other all nine planet. The life does not exist in any other planet except in the earth.
