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As with the spoken languages, the ethnic group composition also remains a point of debate, mainly regarding the largest and second largest ethnic groups, the Persians and Azerbaijanis, due to the lack of Iranian state censuses based on ethnicity. The CIA's World Factbook has estimated that around 79% of the population of Iran are a diverse Indo-European ethno-linguistic group that comprise the speakers of Iranian languages, with Persians constituting 53% of the population, Gilaks and Mazanderanis 7%, Kurds 10%, Lurs 6%, and Balochs 2%. Peoples of the other ethnicities in Iran make up the remaining 22%, with Azerbaijanis constituting 16%, Arabs 2%, Turkmens and Turkic tribes 2%, and others 2% (such as Armenians, Talysh, Georgians, Circassians, Assyrians).
Ethnic minorities such as Azerbaijanis make up what percentage of Iran's population?
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The answer: 22%


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The development of a three-field rotation system for planting crops[AA] increased the usage of land from one half in use each year under the old two-field system to two-thirds under the new system, with a consequent increase in production. The development of the heavy plough allowed heavier soils to be farmed more efficiently, aided by the spread of the horse collar, which led to the use of draught horses in place of oxen. Horses are faster than oxen and require less pasture, factors that aided the implementation of the three-field system.
In addition to requiring less pasture, what distinguishes horses from oxen?
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The answer: faster


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The scope of the term "post-punk" has been subject to controversy. While some critics, such as AllMusic's Stephen Thomas Erlewine, have employed the term "post-punk" to denote "a more adventurous and arty form of punk", others have suggested it pertains to a set of artistic sensibilities and approaches rather than any unifying style. Music journalist and post-punk scholar Simon Reynolds has advocated that post-punk be conceived as "less a genre of music than a space of possibility", suggesting that "what unites all this activity is a set of open-ended imperatives: innovation; willful oddness; the willful jettisoning of all things precedented or 'rock'n'roll'". Nicholas Lezard, problematizing the categorization of post-punk as a genre, described the movement as "so multifarious that only the broadest use of the term is possible".
Why is only the broadest use of genre possible when trying to categorize what actually defines post-punk?
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The answer: multifarious


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In an influential 1988 paper, Timothy Rowe defined Mammalia phylogenetically as the crown group mammals, the clade consisting of the most recent common ancestor of living monotremes (echidnas and platypuses) and therian mammals (marsupials and placentals) and all descendants of that ancestor. Since this ancestor lived in the Jurassic period, Rowe's definition excludes all animals from the earlier Triassic, despite the fact that Triassic fossils in the Haramiyida have been referred to the Mammalia since the mid-19th century.
Which group do marsupials and placentals belong to?
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The answer:
therian mammals