How did the effects of physical environmental changes on human cultures MOST likely began?

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate

the crusaders are identified in the painting;

c. by the red crosses on their backs