Central African chimpanzees (Pan troglodytes troglodytes) and bonobos (Pan paniscus) are two different species of chimpanzees that live in sub-Saharan Africa. The map indicates the regions where central African chimpanzees and bonobos can be found.
A scientist claims that central African chimpanzees and bonobos were once a single ancestral population before evolving into two separate species.
Which of the following characteristics of the region could help to explain how a single ancestral population evolved into two separate species of chimpanzees?
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