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 density is the number of individuals per unit area. Population distribution is how individuals are spaced out in their range. Growth rate determines whether a population grows, shrinks, or stays the same size. Age structure is the number of males and females of each age in a population. Population Growth Populations can grow, shrink, or stay the same size. Factors that increase population size include births and immigration, which is the movement of individuals into an area.