infrastructure - the basic physical and organizational structures needed for the operation of a society, including roads, bridges, water supply, and more, population density - the number of individuals within a given area, population limit - the maximum population size an environment can sustainably support, considering available resources, population - a group of organisms of the same species,

Population Density

由
列印
嵌入

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?