Problem: Annelid:

The brain generally forms a ring round the pharynx (throat), consisting of a pair of ganglia (local control centers) above and in front of the pharynx, linked by nerve cords either side of the pharynx to another pair of ganglia just below and behind it. The brains of polychaetes are generally in the prostomium, while those of clitellates are in the peristomium or sometimes the first segment behind the peristomium. In some very mobile and active polychaetes the brain is enlarged and more complex, with visible hindbrain, midbrain and forebrain sections. The rest of the central nervous system is generally "ladder-like", consisting of a pair of nerve cords that run through the bottom part of the body and have in each segment paired ganglia linked by a transverse connection. From each segmental ganglion a branching system of local nerves runs into the body wall and then encircles the body. However, in most polychaetes the two main nerve cords are fused, and in the tube-dwelling genus Owenia the single nerve chord has no ganglia and is located in the epidermis.

Where are polychaetes' bodies?
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A: unanswerable


Problem: Indigenous peoples of the Americas:

Cultural practices in the Americas seem to have been shared mostly within geographical zones where unrelated peoples adopted similar technologies and social organizations. An example of such a cultural area is Mesoamerica, where millennia of coexistence and shared development among the peoples of the region produced a fairly homogeneous culture with complex agricultural and social patterns. Another well-known example is the North American plains where until the 19th century several peoples shared the traits of nomadic hunter-gatherers based primarily on buffalo hunting.

How long was there a homogeneous culture on the North American plains?
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A: until the 19th century


Problem: FA Cup:

The possibility of unlikely victories in the earlier rounds of the competition, where lower ranked teams beat higher placed opposition, known as "giant killings", is much anticipated by the public, and is considered an integral part of the tradition and prestige of the competition, alongside that gained by teams winning the competition. Almost every club in the League Pyramid has a fondly remembered giant-killing act in its history. It is considered particularly newsworthy when a top Premier League team suffers an upset defeat, or where the giant-killer is a non-league club, i.e. from outside the professional levels of The Football League.

What is not considered newsworthy?
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A: unanswerable


Problem: The Sun (United Kingdom):

The Daily Star had been launched in 1978 by Express Newspaper, and by 1981 had begun to affect sales of The Sun. Bingo was introduced as a marketing tool and a 2p drop in cover price removed the Daily Star's competitive advantage opening a new circulation battle which resulted in The Sun neutralising the threat of the new paper. The new editor of The Sun, Kelvin MacKenzie, took up his post in 1981 just after these developments, and "changed the British tabloid concept more profoundly than [Larry] Lamb did", according to Bruce Page, MacKenzie The paper became "more outrageous, opinionated and irreverent than anything ever produced in Britain".

By what year had The Daily Star started impacting The Sun's sales?
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A:
1981