How do the Earth’s physical factors influence population density? When population growth increases in an area, what is happening to the birth rate and age structure of that population?

question 1:

question 2:

increase in birth rate => greater number of young organisms

Explanation:

As altitude above sea level increases, O2 density decreases, the amount of UV rays increases and the difference between daytime and nighttime temperature increases

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs