Final answer:
The term 'anatomically modern human' refers to early Homo sapiens with physical traits like ours today, such as a well-developed chin and a cranial capacity of about 1,400 cc, appearing about 200,000 years ago. Though indistinguishable in appearance from us, they may not have shared our behavioral modernity.
Step-by-step explanation:
The term anatomically modern human refers to any early member of the species Homo sapiens who was virtually indistinguishable in physical traits from humans today, but may not have exhibited the same behavioral modernity. These early modern humans possessed characteristic features such as a taller stature, rounded skulls with steep foreheads, well-developed chins, and moderate brow ridges. Their cranial capacity was about 1,400 cubic centimeters, indicating a brain size within the range of modern humans. The emergence of Homo sapiens began around 200,000 years ago in Africa. Over time, they evolved with smaller faces, jaws, and front teeth but significantly larger brains than their predecessors.
One distinct feature of anatomically modern H. sapiens is the protruding chin, potentially evolved in response to the development of human speech and to withstand stresses from tongue muscle contractions. It's noteworthy to mention that if we were to bring these early humans to the present, dress them in modern clothes, and let them walk on a city street, they could go unrecognized as they would be indistinguishable from today's population.