Name the 4 Early River Valley Civilizations - and include the name of the associated rivers where they're located. [Note: A) The Huang He is also called the Yellow River. B) Although the Yangtze (also called the Chang Jiang) isn't identified on the map below, it also flows into the basin where the Chinese dynasties began.]

"The epidemics and the pandemics are relatively new phenomenon in the human history. The reasonggor that is how people lived, their ability to move in space, the communication between people.

Explanation:

In the past, most of the people had very restricted movement, and during their lives they only lived and were in touch with people in the same area. This was due to the inability to travel long distances, not knowing the world, but also because of restrictions by the rulers Gradually the world was changing, a lot of advancements were invented that enabled the people to move over longer distances in a short period of time. That led to people from different parts of the world to be in touch, to share ideas, technology, foods, goods, but also diseases. Every region in the would has problems with certain diseases, some of which are very infections. As the people started to be in touch with much larger masses of people from diffrent parts of the world, they start bringing diseases with them, causing pandemics, epidemics, some of which had terrible effects."

(These are not my words but this helped me answer the same question you asked.) Hope it helped you aswell!