Birthrate

Crude birthrate- number of births per 1,000 population. Crude death-number of deaths per 1,000 of the population. Rate of Natural increase- produced by subtracting the death rate from the birth rate. Net Migration Rate- the difference between the number of persons entering and leaving a country during a year. An excess of people leaving a country is net migration. An excess people leaving a country is net emigration. A migrate is leaving one country to move to another. All this birthrate is coming from different countries. But some birthrates are increasing and at some points were decreasing. United states of America has a high birthrate and like japan and Africa has a low birthrate. In Japan, the polution is bad so people get sick which causes pregnat woman to get sick and the baby. But in U.S. we don't have as bad air polution so not as much sicknesses.