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.
Answer: A
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In general, fertility rates
A) decrease as per capita income increases. B) decrease as per capita income decreases. C) increase as per capita income increases. D) are unrelated to per capita income.
What stage of wastewater treatment would remove a condom that had improperly been flushed down a toilet?
A) Grit chamber B) Activated-sludge system C) Debris removal D) Anaerobic digestion
Both energy and matter will flow in and out of an open system
Indicate whether this statement is true or false.
A "greenhouse gas" that is currently thought to be a significant cause of recent global warming is ____
a. nitrogen dioxide b. hydrogen peroxide c. ferrous oxide d. carbon dioxide e. hydrogen sulfide