Why is Africa considered the "cradle of the human species"?

Question

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Most of the oldest evidence of Homo sapiens sapiens has been found in Africa, including the fossils of the oldest known human ancestor, Sahelanthropus tchadensis, which dates back to approximately 7 million years ago. Additionally, archaeological sites in Africa reveal evidence of early human behavior such as tool-making and hunting, further supporting the idea that Africa is the cradle of the human species.

Why Is Africa Considered the "Cradle of the Human Species