2. Scientific method- No, the author did not use the scientific method, but the author has used researches who used it. According to the biologist Russell Gray of the University of Auckland in New Zealand, "Linguists spin a bit of a story with case studies of individual languages."
3. Biological Concepts- Species, DNA, Phylogenies,
4. Personal Agenda- Yes, the author does have a personal agenda. Linguists method can revive languages from no more than 10,000 years ago. There are some reasons for the historical study of languages that people appear. Languages distinguish systematically, and they change in their nature of over time. We also can trace individual words and how sound develop from other languages. Furthermore, we also can describe that languages also reflect a change in how people think and see. A person who studies any language other than native, that means English differs from many other languages in having fever ending. As we know that Chinese languages are very complicated, and some other Asian languages go even much further with harder than any variety of words at all and are being accomplished by word order.
5. Evidence- 1. Inventories from 504 languages and evaluated all possible geographic origins of language, from Africa to South America, for sing of progressively declining phoneme frequencies as languages got farther away from a given source. Southwestern Africa emerged as the strongest candidate for an area where language got its start. 2. Austronesian, Bantu, Indo-Europian and Uto-Aztecan. These families contain about one-third of the world's roughly 7,000 languages. 3. Global phoneme patterns say nothing about when Africans started talking, but other evidence does, he says. Seanshell necklaces, engraved pigment chunks and other signs of symbolic cultural behavior date to between 160,000 and 180,000 years ago in Africa.
6. Assumption-1. When Africans started