Problem: Predation:

Predators are often another organism's prey, and likewise prey are often predators. Though blue jays prey on insects, they may in turn be prey for cats and snakes, and snakes may be the prey of hawks. One way of classifying predators is by trophic level. Organisms that feed on autotrophs, the producers of the trophic pyramid, are known as herbivores or primary consumers; those that feed on heterotrophs such as animals are known as secondary consumers. Secondary consumers are a type of carnivore, but there are also tertiary consumers eating these carnivores, quartary consumers eating them, and so forth. Because only a fraction of energy is passed on to the next level, this hierarchy of predation must end somewhere, and very seldom goes higher than five or six levels, and may go only as high as three trophic levels (for example, a lion that preys upon large herbivores such as wildebeest, which in turn eat grasses). A predator at the top of any food chain (that is, one that is preyed upon by no organism) is called an apex predator; examples include the orca, sperm whale, anaconda, Komodo dragon, tiger, lion, tiger shark, Nile crocodile, and most eagles and owlsand even omnivorous humans and grizzly bears. An apex predator in one environment may not retain this position as a top predator if introduced to another habitat, such as a dog among alligators, a skunk in the presence of the great horned owl immune to skunk spray, or a snapping turtle among jaguars; a predatory species introduced into an area where it faces no predators, such as a domestic cat or a dog in some insular environments, can become an apex predator by default.

Which organisms are known as primary consumers?
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A: Organisms that feed on autotrophs

Problem: Under New York State's gradual abolition act of 1799, children of slave mothers were born to be eventually liberated but were held in indentured servitude until their mid-to-late twenties. Together with slaves freed by their masters after the Revolutionary War and escaped slaves, a significant free-black population gradually developed in Manhattan. Under such influential United States founders as Alexander Hamilton and John Jay, the New York Manumission Society worked for abolition and established the African Free School to educate black children. It was not until 1827 that slavery was completely abolished in the state, and free blacks struggled afterward with discrimination. New York interracial abolitionist activism continued; among its leaders were graduates of the African Free School. The city's black population reached more than 16,000 in 1840.
In 1840, about how many African-Americans lived in New York City?
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Answer: 16,000

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Hurling and football are the most popular spectator sports in the city. Hurling has a strong identity with city and county with Cork winning 30 All-Ireland Championships. Gaelic football is also popular, and Cork has won 7 All-Ireland Senior Football Championship titles. There are many Gaelic Athletic Association clubs in Cork City, including Blackrock National Hurling Club, St. Finbarr's, Glen Rovers, Na Piarsaigh and Nemo Rangers. The main public venues are Pairc Ui Chaoimh and Pairc Ui Rinn (named after the noted Glen Rovers player Christy Ring). Camogie (hurling for ladies) and women's gaelic football are increasing in popularity.
What does football have a strong identity with?
A: unanswerable

Context and question: Schwarzenegger, who dreamed of moving to the U.S. since the age of 10, and saw bodybuilding as the avenue through which to do so, realized his dream by moving to the United States in September 1968 at the age of 21, speaking little English. There he trained at Gold's Gym in Venice, Los Angeles, California, under Joe Weider. From 1970 to 1974, one of Schwarzenegger's weight training partners was Ric Drasin, a professional wrestler who designed the original Gold's Gym logo in 1973. Schwarzenegger also became good friends with professional wrestler Superstar Billy Graham. In 1970, at age 23, he captured his first Mr. Olympia title in New York, and would go on to win the title a total of seven times.
How old was Schwarzenegger when he moved to the U.S.?
Answer: 21

Question: Early research into circadian rhythms suggested that most people preferred a day closer to 25 hours when isolated from external stimuli like daylight and timekeeping. However, this research was faulty because it failed to shield the participants from artificial light. Although subjects were shielded from time cues (like clocks) and daylight, the researchers were not aware of the phase-delaying effects of indoor electric lights.[dubious discuss] The subjects were allowed to turn on light when they were awake and to turn it off when they wanted to sleep. Electric light in the evening delayed their circadian phase.[citation needed] A more stringent study conducted in 1999 by Harvard University estimated the natural human rhythm to be closer to 24 hours, 11 minutes: much closer to the solar day but still not perfectly in sync.
Is there an answer to this question: To what is the 24 hours, 11 minutes day outcome of research closest ?

Answer: solar day

Travel and tourism continue to be extremely important for Portugal, with visitor numbers forecast to increase significantly in the future.[citation needed] However, the increasing competition from Eastern European destinations continues to develop, with the presence of similar attractions that are often cheaper in countries such as Croatia. Consequently, it has been necessary for the country to focus upon its niche attractions, such as health, nature and rural tourism, to stay ahead of its competitors.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): With what area does Portugal compete with for tourists?
Ah, so..
Eastern European destinations