It can be a challenge to distinguish allergic symptoms from dry eye symptoms. Treating a patient who presents with concurrent allergy and dry eye symptoms, however, can be an even greater challenge.
User: how did chinas physical geography affect the development of its early civilizationWeegy: Chinas physical geography affected the development of its early civilization, because they were not close to any other countires, so they did not know to trade with other countries or did not know any other cultures.
Geography of China. China has great physical diversity. The eastern plains and southern coasts of the country consists of fertile lowlands and foothills, and is the location of most of China's agricultural output and human population. The southern areas of the country (South of the Yangtze River) consists of hilly and mountainous terrain.