Final answer:
The Regional Continuity model suggests that Homo sapiens evolved from earlier Homo species in different regions at the same time, while the Complete Replacement/Out of Africa model proposes that Homo sapiens emerged in Africa and migrated to replace other Homo species in different parts of the world.
Step-by-step explanation:
The two main models/hypotheses for the origin of anatomically modern Homo sapiens are the Regional Continuity model and the Complete Replacement/Out of Africa model.
The Regional Continuity model suggests that Homo sapiens evolved from earlier Homo species in different regions of the world at the same time. This model is based on the observation of diverse modern human traits in different populations around the world. It suggests that there was constant gene flow and interbreeding between different Homo populations.
The Complete Replacement/Out of Africa model proposes that Homo sapiens emerged first in Africa approximately 200,000 years ago. Then, approximately 100,000 years ago, a group of Homo sapiens migrated out of Africa and replaced other Homo species in different parts of the world. This model is supported by genetic evidence that shows a common ancestry of all non-African populations with African populations.