Final answer:
The multiregional and replacement models of human origins differ in their explanations for the emergence of Homo sapiens and extinction of other human species.
Step-by-step explanation:
The two models of human origins, multiregional and replacement, differ in their explanations for the emergence of Homo sapiens and the extinction of other human species. The multiregional model suggests that Homo sapiens evolved from Homo erectus in several regions around the same time, resulting in the diversity of human traits seen in different populations. On the other hand, the replacement model proposes that modern humans emerged first in Africa approximately 200,000 years ago and then expanded out of Africa, replacing other human species.