The number of people over 65 represented as a percentage of the labor force is described as a(n)
A) dependency ratio.
B) elderly support ratio.
C) K-12 support ratio.
D) national retirement ratio.
E) demographic transition.
Answer: B
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____________________ is based on energy-efficient and money saving building designs.
Fill in the blank(s) with the appropriate word(s).
The current world population is estimated at about 9 billion
Indicate whether the statement is true or false.
Which of the following is an accurate statement regarding large scale currents in the ocean?
A. They move a lot of sediments around in the deepest ocean environments. B. They are commonly responsible for big waves. C. They are randomly organized in terms of their shape and motion. D. They are caused primarily by tides. E. They commonly influence the climate of the ocean and the surrounding land masses.
Biofuels are ________
A) fuels that use electrical currents to power automobiles B) batteries that fuel automobiles and buses C) fuels that are derived from plant material D) batteries that derive energy from plant material E) devices that directly convert fuel to electrical currents