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.
exists and is an alternate of . The checks to population growth which are the result of overcrowding, such as competition. Density independent factors, like fire and drought, will occur whatever the state of the population. 1 person found this useful.