Answer:
<h3>The invention of gunpowder.</h3>
Explanation:
- The post classical era often called as post ancient period is the period between 6th century AD to 15th century AD. This period is also known as the medieval period and is known for the various discoveries and inventions made during this age.
- It was during the post classical era China invented the four greatest inventions of all time. They were the gunpowder, printing press, paper and compass.
- The invention of gunpowder changed the whole scenario of warfare. It had a very powerful impact on the ways of battles and warfare all over the world.
The first civilizations developed in North Africa, Middle East, and South and East Asia because of the advantages that this areas offered to the people inhabiting them. The biggest advantage were the big rivers with long and wide fertile plains beside them, which enabled the people to be involved in agriculture and produce big amounts of food and even reserves. Since the food problem was solved, they were able to concentrate on other things in their spare time and started to develop architecture, sciences, philosophy, writing systems...
Psychology is a study of human behavior and mind, both conscious and unconscious. This study may be enriched by the knowledge of cultural differences because the differences allow us to better understand the behavior and the way others think. We will not then be easy to judge other people by the way they are.
The answer is B. from the consent of the governed.
