since how many years has the country been inhabited by humans?
Archaeological evidence suggests that early hominids inhabited China between 2.24 million and 250,000 years ago.
China
Archaeological evidence suggests that early hominids inhabited China between 2.24 million and 250,000 years ago. 
what did rulers of the ming and qing dynasties have in common The "Mingshi" – the official history of the Ming dynasty was compiled by the Qing dynasty. when did the first dynasty rose to power? 1368. was there any remarkable progress in terms of technology during their period? Yes, the telescope, the "Yuanjingshuo" ("Far Seeing Optic Glass") and the field mill. how many ministries did they have? Six. which were they? Personnel, Revenue, Rites, War, Justice, and Public Works. which natural calamities did they face? Famines, floods and eathquakes. which emperor consolidated the second dynasty? Kangxi Emperor. which were their administrative branches? Each province was administered by a governor (, "xunfu") and a provincial military commander (, "tidu"). Below the province were prefectures (, "fu") operating under a prefect (, "zhīfǔ"), followed by subprefectures under a subprefect. The lowest unit was the county, overseen by a county magistrate. The position of viceroy or governor-general (, "zongdu") was the highest rank in the provincial administration. what were the different social levels in the society? Aristocracy, and the degree-holding literati, commoners - scholars, farmers, artisans and merchants, mean people - slaves or bondservants, entertainers (including prostitutes and actors), tattooed criminals, and those low-level employees of government officials. were the gender roles fixed? No. in which modern day country did these dynasties exist? China.
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China [SEP] Prehistory
Archaeological evidence suggests that early hominids inhabited China between 2.24 million and 250,000 years ago. The hominid fossils of Peking Man, a "Homo erectus" who used fire, were discovered in a cave at Zhoukoudian near Beijing; they have been dated to between 680,000 and 780,000 years ago. The fossilized teeth of "Homo sapiens" (dated to 125,000–80,000 years ago) have been discovered in Fuyan Cave in Dao County, Hunan. Chinese proto-writing existed in Jiahu around 7000 , Damaidi around 6000 , Dadiwan from 5800 to 5400 , and Banpo dating from the 5th millennium . Some scholars have suggested that the Jiahu symbols (7th millennium ) constituted the earliest Chinese writing system.