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.
A: The main cause of rapid population growth is when there are more births than there are deaths, which is referred to as a natural increase. Other causes of rapid population growth include an increase in food production and distribution, improvement in public health and the elimination of many diseases.