the two areas that made it possible for people in these ecosystems to use the trans- Saharan trade route
1. Geographic location: The ecosystems in the areas surrounding the trans-Saharan trade route provided natural resources such as salt, gold, and other goods that were highly valued in other regions. This allowed the people in these ecosystems to engage in trade with merchants traveling along the route.
2. Cultural networks: People in these ecosystems had established trade networks and alliances with other groups along the trans-Saharan trade route. This allowed for the exchange of goods, ideas, and technologies, making it possible for people in these ecosystems to benefit from the trade route.