What vulnerabilities and challenges did more complex civilizations face?

The vulnerabilities and challenges that more complex civilizations faced disease, conflict, and shortages of food since these societies were so populated. Due to its sheer population, an epidemic could happen if an outbreak of disease happens.

However, countermeasures were prepared to address these vulnerabilities, such as storing food and water.

after world war ii, the united states and the soviet union were the major economic, military, and political powers. the world was bilateral multipolar bipolar unilateral

after world war ii, the united states and the soviet union were the major economic, military, and political powers. the world was bipolar.  

the great leap forward, mao zedong's plan to increase china's agricultural and industrial production, was an overwhelming success. true false

the great leap forward, mao zedong's plan to increase china's agricultural and industrial production, was an overwhelming success. true.

explanation:

what are the options ?