•Spectral Class and Temperature
•Short Main-Sequence Lifespan
The answer is capitalist economy.
The systematic study of human population is called, demography.
Answer:
"In Brief. Sometime between 195,000 and 123,000 years ago, African Homo sapiens populations plummeted, thanks to cold, dry climate conditions that left much of the land uninhabitable. Everyone alive today is descended from people from a single region who survived this catastrophe."
Explanation:
i got it off google..hope it helps you.
