Scientific paradigms can be characterized by all of the following except
A. determine which questions we understand to be relevant to issues at hand.
B. once agreed upon remain unchanged forever.
C. are broad patterns of thought that guide thinking.
D. influence how we interpret evidence.
Answer: B
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How many cleavage directions does this mineral specimen display?
A) 1 B) 2 C) 3 D) 4
The first major US initiative to clean up the nation's air was
A) the 1870 Clean Air Act. B) the 1920 Clean Air Act. C) the 1970 Clean Air Act. D) the Magna Carta.
In general, humans can harvest renewable resources of plants and animals at sustainable levels because
A) ecosystems continue to change with new species replacing those that have been harvested. B) new species are always evolving to take the place of those that are harvested. C) organisms naturally produce many more offspring than are needed to maintain their populations. D) people naturally harvest organisms only after they have had a chance to reproduce.
Approximately how many viral and cellular oncogenes are currently known?
A) 50 B) 100 C) 200 D) 500