Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In 1968, while selling 50 million comic books a year, company founder Goodman revised the constraining distribution arrangement with Independent News he had reached under duress during the Atlas years, allowing him now to release as many titles as demand warranted. Late that year he sold Marvel Comics and his other publishing businesses to the Perfect Film and Chemical Corporation, which continued to group them as the subsidiary Magazine Management Company, with Goodman remaining as publisher. In 1969, Goodman finally ended his distribution deal with Independent by signing with Curtis Circulation Company.
To whom was Marvel sold in 1968?
A: the Perfect Film and Chemical Corporation

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In Chapter II, Darwin specifies that the distinction between species and varieties is arbitrary, with experts disagreeing and changing their decisions when new forms were found. He concludes that "a well-marked variety may be justly called an incipient species" and that "species are only strongly marked and permanent varieties". He argues for the ubiquity of variation in nature. Historians have noted that naturalists had long been aware that the individuals of a species differed from one another, but had generally considered such variations to be limited and unimportant deviations from the archetype of each species, that archetype being a fixed ideal in the mind of God. Darwin and Wallace made variation among individuals of the same species central to understanding the natural world.
What did historians say that naturalists generally thought about the differences in variations in a species?
A: generally considered such variations to be limited and unimportant deviations from the archetype of each species

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The number of entrants has increased greatly in recent years. In the 200405 season, 660 clubs entered the competition, beating the long-standing record of 656 from the 192122 season. In 200506 this increased to 674 entrants, in 200607 to 687, in 200708 to 731 clubs, and for the 200809 and 200910 competitions it reached 762. The number has varied slightly but remained roughly stable since then, with 759 clubs participating in 201011, a record 763 in 201112, 758 for 201213, 737 for 201314 and 736 for 201415. By comparison, the other major English domestic cup, the League Cup, involves only the 92 members of the Premier League and Football League.
How has the number of entrants changed in the League Cup?
A: unanswerable

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Tucson's primary electrical power source is a coal and natural gas power-plant managed by Tucson Electric Power that is situated within the city limits on the south-western boundary of Davis-Monthan Air-force base adjacent to Interstate-10. The air pollution generated has raised some concerns as the Sundt operating station has been online since 1962 as is exempt from many pollution standards and controls due to its age. Solar has been gaining ground in Tucson with its ideal over 300 days of sunshine climate. Federal, state, and even local utility credits and incentives have also enticed residents to equip homes with solar systems. Davis-Monthan AFB has a 3.3 Megawatt (MW) ground-mounted solar photovoltaic (PV) array and a 2.7 MW rooftop-mounted PV array, both of which are located in the Base Housing area. The base will soon have the largest solar-generating capacity in the United States Department of Defense after awarding a contract on September 10, 2010, to SunEdison to construct a 14.5 MW PV field on the northwestern side of the base.
What does Tucson's main power plant use for fuel?
A:
coal and natural gas