The scientific voyages of Charles Darwin
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> Naturalist on "Beagle" voyage (1831), did work on evolution theory in Galapagos Islands
> Discovered gigantic fossils of extinct mammals
> He solved the mystery of the formation of coral reefs and atolls
> Darwin noticed similarities among species with variations based on specific locations, leading to theory of natural selection
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Which of the following is a chemical property of silicon?
A. its density B. its ability to react with oxygen C. its melting point D. its ability to conduct electricity E. both C and D
Suppose the wind speed doubles. Which of the following expresses the factor by which the force of the wind increases?
A. 1.5 B. 8 C. 4 D. 2
Which type of estuary is characterized by the least variation in salinity with depth at any given point along its axis?
A. a well-mixed estuary B. a salt wedge estuary C. a partially mixed estuary D. a fjord E. None of these is correct; it is impossible to tell from the information given.
How do the rates of land use and gasoline consumption in Australian cities compare with those in U.S. cities?
A) At any level of per capita land consumption, people in U.S. cities use more gasoline than those in Australian cities. B) The rates of land use and gasoline consumption in U.S. cities are similar to those in Australian cities. C) At any level of per capita land consumption, people in U.S. cities use less gasoline than those in Australian cities. D) The answer cannot be determined from the graph.