Most countries were ruled by kings, queens, or priests.
Answer:
Life began on Earth at least 3.5 to 4 billion years ago, and it has been evolving ever since. At first, all living things on Earth were simple, single-celled organisms. Much later, the first multicellular organisms evolved, and after that, Earth's biodiversity greatly increased.
Explanation:
Answer: All known historical and modern economies are examples of mixed economies, though some economists have critiqued the economic effects of various forms of mixed economy.
Explanation:
