Respuesta :

Incomplete questions. Here is part of the complete questions:

  1. What is NOT a major river valley in Asia (Tigris-Euphrates, Nile, Indus, Huang He)?
  2. What is the caste system?
  3. What important African trading center became a famous center for learning and culture?

Answer:

1. the Nile

2. strict social structure of India

3. Timbuktu

Explanation:

1. We can rightly make this conclusion because even though the Nile is a major river, it is actually located in the continent of Africa, (specifically northeastern Africa).

2. Indeed, the caste system was introduced in. This system requires a strict social structure, in which individuals in the society are ranked by their status etc.

3.  The African country of Timbuktu had a major role in African trade, it became a center for African trading. It also contributed to learning and culture.