The Amazing Caves of ZhoukoudianIn the 1920sArchaeologists discovered some 1._ human bones, which came from an unknown 2._ of man and were the first evidence of 3._ human life in China.In 1929A complete skull was discovered and 4._ were also found. These discoveries proved the 5._ of a human species who lived in the area between 700,000 and 200,000 years ago.prehistoricspeciesprimitivealmost 200 itemsexistenceThe Amazing Caves of ZhoukoudianIn 1937When Japan 6._ China, excavations at the Beijing Man Site stopped and most of the fossils 7._.In 1949Zhoukoudian became an important 8._ attraction.In 1987Zhoukoudian was 9._ as a world heritage site, which has provided amazing 10._ about the process of evolution.invadeddisappearedtouristlistedevidence