explain the historical circumstances that led to the development of cities and civilizations of the Paleolithic age ?

Explanation:

Foundational civilizations developed urbanization and complexity without outside influence ... Geography alone cannot explain the rise of the first civilizations. ... and also led to more specialized roles, such as bureaucrats, priests, and scribes. Cities concentrated political, religious, and social institutions that were previously

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

it maybe, we dont know. however lucky the lipercon seams guilty