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.
Factors that cause population growth include increased food production, improved health care services, immigration and high birth rate. These factors have led to overpopulation, which has more negative effects than positive impacts. Keep Learning.
Population growth is the rate of increase in the size of a given area, such as a city, country or continent. Population growth is closely linked to fertility, which is the rate at which women produce offspring. Due to the limited resources on earth and in various countries, rampant population growth can lead to inadequate food and other amenities, so in certain cases it can be beneficial to attempt to limit population growth.