What creates a similarity between regions? ( human geography)

Those factors are common traits such as culture, political system, religious beliefs, language or physical features. Some regions are based on culture (language or religion), while physical geography defines others. There is not total agreement, however, among geographers on how all regions are defined.

Explanation:

pls make me braniest if I'm right

hope it helps

i'm sure the answer you are looking for would be

a. an ice age

hope this contact me if this didn't or you need with more answers : )