Indeed, it appears that the pathways involved in language production and comprehension are not all just simply recent elaborations of connections within the cortex but often run through the very deepest and, according to some authors, the most primitive parts of the brain. Language ability is not an add- on like fancy hubcaps on a car. Like Bickerton, I suspect that this was a protolanguage of sorts, simple in content and structure, but a means of communication beyond that of apes and of australopithecines. The more important questions are Homo. This latter is a fatal theological problem with his view.
Species is a quite maleable term.
The herring gull extends across the Atlantic Ocean to England and Scandinavia, where it coexists with the lesser black-back. The pitch and frequency of their calls are different. Here, then, are two gulls at opposite ends of their geographical range that still belong to the same gene pool if a mutant can be imagined as passing from gull to gull round the North Pole but that in Europe have become adapted to different ecological niches. The gulls are an example of both geographical and ecological isolation. For if, by the trespass of the one MAN, death reigned through that one MAN, how much more will those who receive God's abundant provision of grace and of the gift of righteousness reign in life through the one MAN, Jesus Christ.