According to the work of Lieberman and Laitman, language as we know it…
According to the work of Lieberman and Laitman, language as we know it appeared about ________ years ago and is associated with the development of the vocal tract and other capabilities of A) 6,000 / modern civilized humans B) 2 million / Homo habilis C) 3 million / Neanderthals D) 100,000 / Homo sapiens