When the world's population reached 6 billion in 1995, it was forecast that at a steady rate of growth the population would reach 12 billion in approximately 45 years. That period of 45 years is known as
A) doubling time.
B) doubling life expectancy.
C) double increase rate.
D) double overpopulation.
E) double demographic transition.
Question 2
If the physiological density in a given country is very high and its arithmetic density is very low, then a country has
A) inefficient farmers or farmers that are out of work.
B) a large number of farmers, although the number of farmers is not as great as the number of people living in the cities.
C) a small percentage of land suitable for agriculture, even if there seems to be plenty of space available to live in.
D) too many people for the available resources, particularly in regards to agricultural land.
E) too few farmers for the large area of land suitable for agriculture.
Body size and population density of herbivorous mammals
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