Population density is a measurement of population per unit area, or exceptionally unit volume; it is a quantity of type number density. It is frequently applied to living organisms, most of the time to humans. It is a key geographical term. Hope this answered your question
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The main religions that are followed in East Asia are Buddhism, Christianity, Confucianism, Hinduism, Islam, Jainism, Judaism, Shinto, Sikhism, Taoism, and Zoroastrianism. Taoism and Confucianism have both originated in the 5th or 6th century bce ^_^
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I believe that the discovery of new artifacts can bring many improvements to historical interpretations along with additional information for understanding historical facts. Thus, new causes can be found and analyzed that could lead to a certain phenomenon.