In the form of Egyptian hieroglyphs –emerged in Africa from the 4th century BCE. In Ethiopia, the Ethiopic script was developed in the 4th century CE, and in Sudan the Meroïtic script was created about 180 BCE. The Tifinagh script is of particular importance for West Africa.
The answer is "B", varied ecological regions.
Oklahoma contains 10 distinct ecological regions. That is more ecological regions per square mile than in any other state by a wide margin.
Such groups include hunter-gatherers, pastoral nomads (owning livestock), and tinkers or trader nomads. In the twentieth century, population of nomadic pastoral tribes slowly decreased, reaching to an estimated 30–40 million nomads in the world as of 1995.
