เราใช้ภาษาในการแยกกลุ่ม แทนที่จะใช้

We use the language in a separate group rather than a physical in the same region, because they have similar physical characteristics. It's difficult to use physical separation group. If the same national ancestry, but it cannot be known distributions that are used in physical separation. So we use the language as a separate group. Although there will be a separate ethnic group, but one that is still a language unique to it.

We use language in a separate group. Instead of using physical because in the region that have similar physical characteristics. It's hard to take a physical in separate groups. If the same race, but scattered. It can not be used in the physical separation. So we use language as a separate group. Although ethnic groups to live together, but there is one language that is still unique to it.

We use language in separate groups. Instead of using physical, because in the same region with similar physical characteristics It"s hard to use the physical in a separate group. If have the same national but spread. It can not be used in physical isolation. Therefore, we use the language as a separate group. Although ethnic groups are separated but still its unique language one.