Problem: Digestion:

Teeth (singular tooth) are small whitish structures found in the jaws (or mouths) of many vertebrates that are used to tear, scrape, milk and chew food. Teeth are not made of bone, but rather of tissues of varying density and hardness, such as enamel, dentine and cementum. Human teeth have a blood and nerve supply which enables proprioception. This is the ability of sensation when chewing, for example if we were to bite into something too hard for our teeth, such as a chipped plate mixed in food, our teeth send a message to our brain and we realise that it cannot be chewed, so we stop trying.

What are teeth made out of?
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A: enamel, dentine and cementum

Problem: Cities not served by road, sea, or river can be reached only by air, foot, dogsled, or snowmachine, accounting for Alaska's extremely well developed bush air servicesan Alaskan novelty. Anchorage and, to a lesser extent Fairbanks, is served by many major airlines. Because of limited highway access, air travel remains the most efficient form of transportation in and out of the state. Anchorage recently completed extensive remodeling and construction at Ted Stevens Anchorage International Airport to help accommodate the upsurge in tourism (in 2012-2013, Alaska received almost 2 million visitors).
What is the most efficient means of transportation into and out of Alaska?
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Answer: air travel

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
On April 6, 1990, the Lviv City Council voted to return St. George Cathedral to the Ukrainian Greek Catholic Church. The Russian Orthodox Church refused to yield. On April 2930, 1990, the Ukrainian Helsinki Union disbanded to form the Ukrainian Republican Party. On May 15 the new parliament convened. The bloc of conservative communists held 239 seats; the Democratic Bloc, which had evolved into the National Council, had 125 deputies. On June 4, 1990, two candidates remained in the protracted race for parliament chair. The leader of the Communist Party of Ukraine (CPU), Volodymyr Ivashko, was elected with 60 percent of the vote as more than 100 opposition deputies boycotted the election. On June 56, 1990, Metropolitan Mstyslav of the U.S.-based Ukrainian Orthodox Church was elected patriarch of the Ukrainian Autocephalous Orthodox Church (UAOC) during that Church's first synod. The UAOC declared its full independence from the Moscow Patriarchate of the Russian Orthodox Church, which in March had granted autonomy to the Ukrainian Orthodox church headed by Metropolitan Filaret.
Who became the new patriarch of the UAOC in 1990?
A: Metropolitan Mstyslav

Context and question: The Spanish ship San Pedro and two other vessels in an expedition commanded by Miguel Lopez de Legazpi discovered an island on January 9, 1530, possibly Mejit, at 10N, which they named "Los Barbudos". The Spaniards went ashore and traded with the local inhabitants. On January 10, the Spaniards sighted another island that they named "Placeres", perhaps Ailuk; ten leagues away, they sighted another island that they called "Pajares" (perhaps Jemo). On January 12, they sighted another island at 10N that they called "Corrales" (possibly Wotho). On January 15, the Spaniards sighted another low island, perhaps Ujelang, at 10N, where they described the people on "Barbudos". After that, ships including the San Jeronimo, Los Reyes and Todos los Santos also visited the islands in different years.
Who led the expedition involving the ship San Pedro?
Answer: Miguel Lopez de Legazpi

Question: The Scheinergrade (Sch.) system was devised by the German astronomer Julius Scheiner (18581913) in 1894 originally as a method of comparing the speeds of plates used for astronomical photography. Scheiner's system rated the speed of a plate by the least exposure to produce a visible darkening upon development. Speed was expressed in degrees Scheiner, originally ranging from 1 Sch. to 20 Sch., where an increment of 19 Sch. corresponded to a hundredfold increase in sensitivity, which meant that an increment of 3 Sch. came close to a doubling of sensitivity.
Is there an answer to this question: When did the Scheinergrade system become outdated?

Answer: unanswerable

QUES: Federalism also finds expression in ecclesiology (the doctrine of the church). For example, presbyterian church governance resembles parliamentary republicanism (a form of political federalism) to a large extent. In Presbyterian denominations, the local church is ruled by elected elders, some of which are ministerial. Each church then sends representatives or commissioners to presbyteries and further to a general assembly. Each greater level of assembly has ruling authority over its constituent members. In this governmental structure, each component has some level of sovereignty over itself. As in political federalism, in presbyterian ecclesiology there is shared sovereignty.

What doesn't happen in Presbyterian denominations?
What is the answer?
ANS:
unanswerable