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.
These acted natural barriers, separating China from the rest of the world. But not all China's geography were barriers. China has two major river systems that provided fertile soil and safe drinking water. The early people called the rivers in China The Great Sorrow. That's because each spring the rivers would overflow their banks. The Yangtze River had high banks which kept the homes built on high ground safe.