Biofuels are ________
A) batteries that fuel automobiles and buses
B) batteries that derive energy from plant material
C) devices that directly convert fuel to electrical currents
D) fuels that use electrical currents to power automobiles
E) fuels that are derived from plant material
E
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Slash-and-burn—the name given to an early innovation that enabled the growth of minisystems into early world-empires—refers to an innovation in
A) agriculture. B) warfare. C) metal-working. D) urbanization. E) colonization.
The mammal-like reptiles at the end of the Paleozoic were ____
a. thecodonts
b. therapsids c. protoavis d. hesperornis e. monotremes
Within the Ferrel cell, surface air flows ________.
A. toward the equator B. poleward C. parallel to the pressure gradient force D. to the west
Raising the floor of a building above the 100-year flood level prevents most erosion that occurs
a. True b. False