birth rate - the number of births in a population in a certain amount of time, death rate - the number of deaths in a population in a certain amount of time, immigration - moving into a population, emigration - moving out of a populatoin, population density - number of individuals per unit area,

Population Changes

列印
嵌入

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?