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.
This is a limiting factor because plants and animals die from this type of natural disaster if populations do not move far enough away from the mountain. Density dependent factors are different in that the size of populations affect how certain factors increase or decrease numbers of specimens. Predation, disease and competition for resources affect populations based on their size.