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.
There are many factors that can influence the size of a population. Some factors result in an increase in the population, while others can cause a decrease in population size. Factors that Increase Population Size. There are two factors that result in an increase in the size of a population.