Unlike solar, hydropower plants ________
A) do not pose a great safety risk B) can be added to gradually as demand grows
C) can consistently generate electricity at night D) can be constructed quickly
C
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The dramatic increase in yields associated with the second agricultural revolution coincided with
A) a commercial market for food created by the growing urban labor force. B) the advent of communism and the emergence of communal farming systems. C) the arrival of crops (potatoes, tomatoes, peppers, chocolate) from the New World. D) the introduction of hybrid seeds and GMOs (genetically modified organisms). E) the large influx of migrants from peripheral to core countries.
In a battery, the following oxidation-reduction reactions are taking place: Mn2O3 + ZnO ? 2 MnO2 + Zn What is undergoing an oxidation as written?
A) Zn B) ZnO C) MnO2 D) Mn2O3 E) none of the above
The form of autotrophy in which organic molecules are produced without using sunlight is called ____
A) respiration B) chemosynthesis C) heterotrophy D) decomposition
From 1979 to 1989, what foreign power had troops on the ground in Afghanistan?
A) Soviet Union B) China C) United States D) India E) Pakistan