Final answer:
The theory of human evolution and the migration of Homo sapiens out of Africa is discussed in this Biology question.
Step-by-step explanation:
The subject of this question is Biology. The theory being discussed is the theory of human evolution and the migration of Homo sapiens out of Africa. This theory suggests that modern humans emerged in Africa approximately 200,000 years ago and then migrated out of Africa, replacing other human species. It is also known as the replacement theory.