<span>Scientists choose where are units of time began and ended based on major changes in life forms at certain times</span>
The answer is A (own at least twenty slaves)
Explanation:
Developed Countries: Developed Countries have advanced economies, good infrastructure, and a high standard of living. Their markets will be highly regulated and high per capita income.
Emerging Countries: These countries will have a developing and manufacturing base with rudimentary infrastructures. Emerging countries are the suppliers of natural resources to the more advanced and developed countries. Their per capita income would be low as compared to developed nations.
Developing Countries: Developing countries economies are the same as the emerging countries.
