In the African civilitation which are the two areas that made it possible for people in these ecosystems to use the trans-Saharan trade route?.

The two key areas that made it possible for people in African civilizations to use the trans-Saharan trade route are:

1. The Sahel region: This semi-arid belt of land south of the Sahara Desert provided a natural corridor for trade between North Africa and West Africa. The Sahel was home to different groups of people who acted as intermediaries, facilitating the exchange of goods between the two regions.

2. The oases and trade cities in North Africa: Along the northern edge of the Sahara Desert, there were various oases and trade cities such as Timbuktu, Gao, and Djenne, which served as important trading posts along the trans-Saharan trade route. These cities were strategically located along the route, providing rest, supplies, and a market for merchants traveling between North and West Africa.