The problem: Answer a question about this article:
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?
****
The answer: generally considered such variations to be limited and unimportant deviations from the archetype of each species

The problem: Answer a question about this article:
Although the firearms used by the infantry, particularly machine guns, can be used to engage low altitude air targets, on occasion with notable success, their effectiveness is generally limited and the muzzle flashes reveal infantry positions. Speed and altitude of modern jet aircraft limit target opportunities, and critical systems may be armored in aircraft designed for the ground attack role. Adaptations of the standard autocannon, originally intended for air-to-ground use, and heavier artillery systems were commonly used for most anti-aircraft gunnery, starting with standard pieces on new mountings, and evolving to specially designed guns with much higher performance prior to World War II.
Heavier artillery systems were typically used for what?
****
The answer: most anti-aircraft gunnery

The problem: Answer a question about this article:
The Swiss Federal budget had a size of 62.8 billion Swiss francs in 2010, which is an equivalent 11.35% of the country's GDP in that year; however, the regional (canton) budgets and the budgets of the municipalities are not counted as part of the federal budget and the total rate of government spending is closer to 33.8% of GDP. The main sources of income for the federal government are the value-added tax (33%) and the direct federal tax (29%) and the main expenditure is located in the areas of social welfare and finance & tax. The expenditures of the Swiss Confederation have been growing from 7% of GDP in 1960 to 9.7% in 1990 and to 10.7% in 2010. While the sectors social welfare and finance & tax have been growing from 35% in 1990 to 48.2% in 2010, a significant reduction of expenditures has been occurring in the sectors of agriculture and national defense; from 26.5% in to 12.4% (estimation for the year 2015).
Which sectors are the main source of expenditures for the federal government?
****
The answer: social welfare and finance & tax

The problem: Answer a question about this article:
Consequently, the population of Israel rose from 800,000 to two million between 1948 and 1958. Between 1948 and 1970, approximately 1,150,000 Jewish refugees relocated to Israel. The immigrants came to Israel for differing reasons. Some believed in a Zionist ideology, while others moved to escape persecution. There were others that did it for the promise of a better life in Israel and a small number that were expelled from their homelands, such as British and French Jews in Egypt after the Suez Crisis.
What ideology did some immigrants believe in?
****
The answer:
Zionist