Other sites let you use the Google Authenticator app to generate the six-digit number. The app generates a different six-digit number for each connected site, and these numbers change every 30 seconds. With the app, you don't have to wait a few seconds to receive a text message.
Population depends on the rate of growth , as well as external factors. Population is influenced by factors like birth rate & death rate . Birth rate (Natality)- This refers to the number of newborns in a region at a given time. Death rate (Mortality) - This refers to the number of deaths in a region at a given time.
Impact on Population Size and Age. 1  New immigration (legal and illegal) plus births to immigrants added 22.5 million residents to the country over the last decade, equal to 80 percent of total U.S. population growth. 2  Recent immigration has had only a tiny impact on the nationâs age structure.