What is demographic transition? 

A)  It is the slowing down in the growth of a population that occurs when the population approaches its carrying capacity. 
B)  It is the decline in death rates followed by a decline in birth rates that occurs when a country becomes industrialized. 
C)  It is the decline in death rates followed by a decline in birth rates that occurred when the germ theory of disease was discovered. 
D)  It is the requirement for a population to reach a specific size before it becomes stable.

Wilderness is a large area of land legally set aside to prevent or minimize it from being harmed by human activities.

____________________ are the most common chemicals leading to the depletion of the ozone in the stratosphere.