Final answer:
All humans are believed to have evolved from Africa based on genetic evidence and the 'out of Africa' model of human evolution. The statement suggesting modern humans evolved from Australopithecus directly is not in line with this model. The widely accepted theory is supported by modern genetic research and fossil records.
Step-by-step explanation:
The student's question asks which group of humans is believed to have not evolved in Africa. Based on the information provided, we can deduce that the statement suggesting 'Fully evolved modern humans descended directly from Australopithecus' does not align with the widely accepted 'out of Africa' model of human evolution. This model posits that modern humans, Homo sapiens, evolved first in Africa approximately 200,000 years ago and later spread across the globe. This migration led to interbreeding with other species such as Neanderthals before the eventual replacement of other human species. The alternative 'multiregional evolution model' proposes simultaneous evolution from Homo erectus in multiple regions, but it has less support due to modern genetic evidence which shows that all humans share common ancestors from Africa.