which are the two areas that made it possible for people in these ecosystems to use the trans-Saharan trade route?.
1. The Sahara Desert: The vast desert acted as a barrier that facilitated the development of the trans-Saharan trade route. Despite its harsh and unforgiving conditions, the desert was home to various groups of nomadic people who were able to traverse the desert and establish trade networks.
2. Oases: Oases provided a vital source of water and resources along the trans-Saharan trade route, allowing travelers to rest and replenish their supplies before continuing their journey. These oases served as important stopping points for caravan traders and helped sustain the exchange of goods and ideas between different regions.