Final answer:
Three competing theories about the origin of modern humans are the 'out of Africa' model, the 'multiregional evolution model', and a hybrid theory that combines aspects of both, supported by recent DNA evidence.
Step-by-step explanation:
There are three notable theories that seek to explain the origins of modern humans. The first is the "out of Africa" model, which posits that Homo sapiens first emerged in Africa about 200,000 years ago and then expanded out of Africa, replacing other human species. Secondly, the "multiregional evolution model" proposes that modern humans evolved from Homo erectus in various regions around the world, an explanation for the diversity seen in modern human traits. Thirdly, a hybrid of these theories suggests that while modern humans may have emerged first in Africa, as they expanded globally, they mixed genetically with other human species. This theory aligns with recent DNA evidence that indicates a complex picture of human evolution. These theories are informed by a combination of archaeological findings and molecular genetics, each providing unique insights into the evolutionary history of Homo sapiens. The ongoing debate underscores the complexity of human origins, with new discoveries continuously shaping our understanding.