A. Because the Egypt and Indus valley are in the desert, living near a river gave access to a food supply, water and better soil for growing crops. There were better resources to build shelter, and the river provided a safe route of transportation to other areas.
The correct answer we are looking for is the transience.
One of the seven sins of memory. The ability of Giorgio to recite a poem fades because of the so called transience.
This is known as the transitory nature. Transience means passing with time or is the state of being brief and short-lived.
Do both of your questions relate to the same thing if so i will be happy to help