Which geographic characteristics of East Africa may have helped to preserve hominid remains? Explain why?

The physical geography of East Africa is dominated by the Great Rift Valley, which extends through the middle of the region from north to south. Associated with the rift valleys are vast savannas such as the Serengeti Plain, large lakes, high mountains, and the highlands of Ethiopia.

Idon't think any of em are right, you need to add the number of what paragraph you got your citation from