Yes, though there are dialect differences.
For the same reason that English is spoken. The language evolved naturally.
Sign languages are as individually different as spoken languages, and, as an interesting side note, sign languages for dialects of the same spoken language may not be related. British Sign Language and American Sign Language are in no way mutually intelligible.
The Quechuan language that is spoken by the Quechua natives of NE Peru was the primary language of the Incan empire. The language is YAGUA
It is a language. In the same way that English is the language spoken by people in England and the USA, Kera is the language spoken by the people of Chad.
No, Dutch and Danish are not the same. Dutch is spoken in the Netherlands, Belgium, and Suriname, while Danish is spoken in Denmark. They belong to different language families - Dutch is a Germanic language, while Danish is a North Germanic language.
No. In Monaco they speak French, Italian or Monegasque. In England they speak English.
The Lak language is used mainly in Brittain, in the central part of Dagestan. Along with the language of Lak, the Dargin (or Dargwa) language is also spoken in this same area.
A foreign language is any language that is not your own. A European language is a language spoken in Europe.
The name "Sarah" is spoken the same in any language.
No, Subanen and Chavacano are not the same language. Subanen is an indigenous language spoken in the Philippines, primarily in the Zamboanga Peninsula. Chavacano, on the other hand, is a Spanish-based creole language spoken in the Philippines, particularly in Zamboanga City and other parts of Mindanao.
The official language spoken in North Korea is Korean.
Spanish is the language spoken in the country of Spain.