Input: Read this: While some birds are essentially territorial or live in small family groups, other birds may form large flocks. The principal benefits of flocking are safety in numbers and increased foraging efficiency. Defence against predators is particularly important in closed habitats like forests, where ambush predation is common and multiple eyes can provide a valuable early warning system. This has led to the development of many mixed-species feeding flocks, which are usually composed of small numbers of many species; these flocks provide safety in numbers but increase potential competition for resources. Costs of flocking include bullying of socially subordinate birds by more dominant birds and the reduction of feeding efficiency in certain cases.
Question: What is a cost of flocking?

Output: bullying of socially subordinate birds by more dominant birds


QUES: There have been six instances as of 2009 in which the exemption process was initiated. Of these six, one was granted, one was partially granted, one was denied and three were withdrawn. Donald Baur, in The Endangered Species Act: law, policy, and perspectives, concluded," ... the exemption provision is basically a nonfactor in the administration of the ESA. A major reason, of course, is that so few consultations result in jeopardy opinions, and those that do almost always result in the identification of reasonable and prudent alternatives to avoid jeopardy."

How can jeopardy opinions be dissuaded?
What is the answer?
ANS: in the identification of reasonable and prudent alternatives to avoid jeopardy.


QUES: Ethnic Russians constitute 25.5% of the country's current population and 58.6% of the native Estonian population is also able to speak Russian. In all, 67.8% of Estonia's population can speak Russian. Command of Russian language, however, is rapidly decreasing among younger Estonians (primarily being replaced by the command of English). For example, if 53% of ethnic Estonians between 15 and 19 claim to speak some Russian, then among the 10- to 14-year-old group, command of Russian has fallen to 19% (which is about one-third the percentage of those who claim to have command of English in the same age group).
What percentage of Russians are between 15 and 19?

ANS: unanswerable


The strides that the Johnson presidency made in ensuring equal opportunity in the workforce were further picked up by his successor Nixon. In 1969 the Nixon administration initiated the "Philadelphia Order". It was regarded as the most forceful plan thus far to guarantee fair hiring practices in construction jobs. Philadelphia was selected as the test case because, as Assistant Secretary of Labor Arthur Fletcher explained, "The craft unions and the construction industry are among the most egregious offenders against equal opportunity laws . . . openly hostile toward letting blacks into their closed circle." The order included definite "goals and timetables." As President Nixon asserted, "We would not impose quotas, but would require federal contractors to show 'affirmative action' to meet the goals of increasing minority employment."
If it is possible to answer this question, answer it for me (else, reply "unanswerable"):  Which industry of jobs did the legislation not target?
Ah, so.. unanswerable


Question: Alloying copper with tin to make bronze was first practiced about 4000 years after the discovery of copper smelting, and about 2000 years after "natural bronze" had come into general use[citation needed]. Bronze artifacts from the Vinča culture date to 4500 BC. Sumerian and Egyptian artifacts of copper and bronze alloys date to 3000 BC. The Bronze Age began in Southeastern Europe around 3700–3300 BC, in Northwestern Europe about 2500 BC. It ended with the beginning of the Iron Age, 2000–1000 BC in the Near East, 600 BC in Northern Europe. The transition between the Neolithic period and the Bronze Age was formerly termed the Chalcolithic period (copper-stone), with copper tools being used with stone tools. This term has gradually fallen out of favor because in some parts of the world the Chalcolithic and Neolithic are coterminous at both ends. Brass, an alloy of copper and zinc, is of much more recent origin. It was known to the Greeks, but became a significant supplement to bronze during the Roman Empire.
Try to answer this question if possible: When did the Silver Age begin in Southeastern Europe?
Answer: unanswerable


Problem: The rapid development of religions in Zhejiang has driven the local committee of ethnic and religious affairs to enact measures to rationalise them in 2014, variously named "Three Rectifications and One Demolition" operations or "Special Treatment Work on Illegally Constructed Sites of Religious and Folk Religion Activities" according to the locality. These regulations have led to cases of demolition of churches and folk religion temples, or the removal of crosses from churches' roofs and spires. An exemplary case was that of the Sanjiang Church.
 What was not an exemplary case of all this?
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Answer:
unanswerable