Which specimen is considered the most ancient undisputed human fossil found outside of Africa?

The specimen recognized as the most ancient undisputed human fossil found outside of Africa is indeed the Dmanisi Homo erectus. This finds its significance in the context of human evolution, particularly as it provides crucial insight into early migrations of hominins from Africa.

Dmanisi, located in Georgia, produced several well-preserved Homo erectus skulls and associated tools, which date back to approximately 1.8 million years ago. This makes them some of the oldest remains of human ancestors discovered outside the African continent. The Dmanisi fossils demonstrate features that show a mix of modern and primitive traits, offering important evidence regarding the adaptability and diversity of early hominins.

The other options, while important in their own right, do not represent the same status in terms of age and undisputed evidence of non-African prehistoric human occupation. For instance, KNM-WT 15000 refers to a specimen found in Kenya, which is still within Africa. Homo habilis also originated in Africa and is generally considered to be one of the earlier species in the human lineage, while Homo neanderthalensis pertains to a later branch of the human family tree predominantly found in Europe and Asia. Each of these has significance, but none match the