Problem: Circadian rhythm:

Circadian rhythms allow organisms to anticipate and prepare for precise and regular environmental changes. They thus enable organisms to best capitalize on environmental resources (e.g. light and food) compared to those that cannot predict such availability. It has therefore been suggested that circadian rhythms put organisms at a selective advantage in evolutionary terms. However, rhythmicity appears to be as important in regulating and coordinating internal metabolic processes, as in coordinating with the environment. This is suggested by the maintenance (heritability) of circadian rhythms in fruit flies after several hundred generations in constant laboratory conditions, as well as in creatures in constant darkness in the wild, and by the experimental elimination of behavioral, but not physiological, circadian rhythms in quail.

By better using resources, how does that improve an organism's chances of surviving?
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A: selective advantage

Problem: 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.
What party was formed from the dissolved Ukrainian Helsinki Union?
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Answer: Ukrainian Republican Party

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Similar to the other Eur-A countries, most Portuguese die from noncommunicable diseases. Mortality from cardiovascular diseases (CVD) is higher than in the eurozone, but its two main components, ischaemic heart disease and cerebrovascular disease, display inverse trends compared with the Eur-A, with cerebrovascular disease being the single biggest killer in Portugal (17%). Portuguese people die 12% less often from cancer than in the Eur-A, but mortality is not declining as rapidly as in the Eur-A. Cancer is more frequent among children as well as among women younger than 44 years. Although lung cancer (slowly increasing among women) and breast cancer (decreasing rapidly) are scarcer, cancer of the cervix and the prostate are more frequent. Portugal has the highest mortality rate for diabetes in the Eur-A, with a sharp increase since the 1980s.
What are the two main components of cardiovascular disease?
A: ischaemic heart disease and cerebrovascular disease

Context and question: South Slavic historically formed a dialect continuum, i.e. each dialect has some similarities with the neighboring one, and differences grow with distance. However, migrations from the 16th to 18th centuries resulting from the spread of Ottoman Empire on the Balkans have caused large-scale population displacement that broke the dialect continuum into many geographical pockets. Migrations in the 20th century, primarily caused by urbanization and wars, also contributed to the reduction of dialectal differences.
What caused the dialect continuum to become fractured?
Answer: migrations from the 16th to 18th centuries resulting from the spread of Ottoman Empire on the Balkans

Question: Human interference has nearly exterminated the trees in many areas, and, except for the beech forests of the Austrian Alps, forests of deciduous trees are rarely found after the extreme deforestation between the 17th and 19th centuries. The vegetation has changed since the second half of the 20th century, as the high alpine meadows cease to be harvested for hay or used for grazing which eventually might result in a regrowth of forest. In some areas the modern practice of building ski runs by mechanical means has destroyed the underlying tundra from which the plant life cannot recover during the non-skiing months, whereas areas that still practice a natural piste type of ski slope building preserve the fragile underlayers.
Is there an answer to this question: What are rarely found after the extreme deforestation between the 17th and 19th centuries?

Answer: forests of deciduous trees

Question: Under the doctrine of Erie Railroad Co. v. Tompkins (1938), there is no general federal common law. Although federal courts can create federal common law in the form of case law, such law must be linked one way or another to the interpretation of a particular federal constitutional provision, statute, or regulation (which in turn was enacted as part of the Constitution or after). Federal courts lack the plenary power possessed by state courts to simply make up law, which the latter are able to do in the absence of constitutional or statutory provisions replacing the common law. Only in a few narrow limited areas, like maritime law, has the Constitution expressly authorized the continuation of English common law at the federal level (meaning that in those areas federal courts can continue to make law as they see fit, subject to the limitations of stare decisis).
Is there an answer to this question: When are states allowed to use plenary power?

Answer:
absence of constitutional or statutory provisions replacing the common law