Compared to the global demand for energy, renewable energy sources can ________
A) meet about half the demand
B) meet only the demand for electricity
C) only meet a small percentage of the demand
D) exceed the demand
E) meet the demand
Answer: D
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Resources that are called nonrenewable are
A. also called perpetual resources. B. the only resources that are alive. C. a fixed quantity in the earth's crust. D. derived from solar capital. E. found almost everywhere on the earth.
In modern world trade,
A) some places are still completely isolated and dependent on local resources. B) all parts of the world have eagerly, voluntarily participated in world trade. C) virtually all peoples have moved from self-sufficiency and cultural isolation to trade and cultural exchange. D) all trade is regulated by the United Nations.
A large body of evidence indicates that human activities are enhancing the earth's natural greenhouse effect and changing the earth's climate.
Answer the following statement true (T) or false (F)
In which of the following proteins is the a-helix the predominant structure?
A) keratin B) silk C) both a and b D) neither a nor b