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.
There are several types of density-dependent factors, but they all have two things in common: they influence the rates of births and deaths, and the effect increases as population size increases. When the density of a population is low (few individuals in a given area), resources are not limiting. There are plenty of resources for everyone. More individuals can give birth, and fewer individuals will die.