instruction:
In this task, you're expected to write answers to questions involving multiple references to the same entity. The answer to the question should be unambiguous and a phrase in the paragraph. Most questions can have only one correct answer.
question:
Passage: John Ottway works in Alaska as a marksman for an undisclosed oil company, killing grey wolves that threaten the drillers. On his last day on the job, he sees a driller  being pursued by a wolf and shoots it. He then watches and listens as the wolf takes a final breath ending in a long deep exhale. That evening, Ottway writes a letter "without purpose" to his wife, Ana, explaining his plans to commit suicide. He hears a distant wolf howl and doesn't follow through.
The next day, Ottway and other oil drillers board a plane. During the flight, Ottway dreams of sleeping with his wife in bed but is awakened by a loud bang. He buckles up in fear of a possible plane crash. Shortly afterwards, the back of the plane is torn off and it crashes. Eight people including Ottway survive the crash. However, a young oil worker, Lewenden, dies of his injuries as Ottway sadly watches. Taking charge, Ottway sets the survivors on the task of building a fire. While doing this, he discovers a corpse, and is attacked by the grey wolf feeding on it. After saving Ottway, the group soon surmises that they are in the wolves' territory. They decide to take turns keeping watch for the predators.
Later, Hernandez is killed by two wolves. Ottway suggests they leave the crash site, but Diaz questions his leadership. While searching for the wallets of their deceased colleagues, intending to return them to their families, Diaz finds an emergency wrist watch containing a radio beacon. The group then leaves the site. 
Question: What is the last name of the person attacked by a grey wolf that was feeding on a corpse?
answer:
Ottway.


question:
Passage: By the late 1950s, Covent Garden was gradually abandoning its policy of productions in the vernacular; such singers as Maria Callas would not relearn their roles in English. This made it easier for Tucker to point up the difference between the two London opera companies. While Covent Garden engaged international stars, Sadler's Wells focused on young British and Commonwealth performers. Colin Davis was appointed musical director in succession to Gibson in 1961. The repertoire continued to mix familiar and unfamiliar operas. Novelties in Davis's time included Pizzetti's Murder in the Cathedral, Stravinsky's Oedipus rex, Richard Rodney Bennett's The Mines of Sulphur and more Janáček. Sadler's Wells's traditional policy of giving all operas in English continued, with only two exceptions: Oedipus rex, which was sung in Latin, and Monteverdi's L'Orfeo, sung in Italian, for reasons not clear to the press. In January 1962, the company gave its first Gilbert and Sullivan opera, Iolanthe, on the day on which the Savoy operas came out of copyright and the D'Oyly Carte monopoly ended.  The production was well received (it was successfully revived for many seasons until 1978) and was followed by a production of The Mikado in May of the same year.The Islington theatre was by now clearly too small to allow the company to achieve any further growth. A study conducted for the Arts Council reported that in the late 1960s the two Sadler's Wells companies comprised 278 salaried performers and 62 guest singers. The company had experience of playing in a large West End theatre, such as its 1958 sell-out production of The Merry Widow that had transferred to the 2,351-seat London Coliseum for a summer season. Ten years later, the lease of the Coliseum became available.  Stephen Arlen, who had succeeded Tucker as managing director, was the primary advocate for moving the company. After intense negotiations and fund-raising, a ten-year lease was signed in 1968.  One of the company's last productions at the Islington theatre was Wagner's The Mastersingers, conducted by Goodall in 1968, which 40 years later was described by Gramophone magazine as "legendary". The company left Sadler's Wells with a revival of the work with which it had re-opened the theatre in 1945, Peter Grimes. Its last performance at the Rosebery Avenue theatre was on 15 June 1968. 
Question: What theatre did the Sadler's Wells company perform prior to 1968?
answer:
Islington theatre.


question:
Passage: Ecosystems in the Everglades have been described as both fragile and resilient. Author Michael Grunwald wrote about the observations of the Everglades' first American visitors: "If the Grand Canyon was a breathtaking painting, the Everglades was a complex drama, and everything in it had a role." An estimated 11,000 species of seed-bearing plants and 400 species of land or water vertebrates live in the Everglades, but slight variations in water levels affect many organisms and reshape land formations. The health and productivity of any ecosystem relies on the number of species present: the loss of one species weakens the entire ecosystem.For example, Florida apple snails (Pomacea paludosa)  are an amphibious fresh water mollusk. They have a single gill and lung, and live on stalks of sawgrass in water depths no more than 20 inches (51 cm). They are the primary food of the endangered snail kite (Rostrhamus sociabilis) and limpkin (Aramus guarauna) as well as the raccoon, otter, and young alligator. Apple snails lay their eggs on sawgrass stalks about 6 inches (15 cm) above the water line, and they are intolerant of being submerged for long periods of time. When the eggs hatch, young snails must enter the water quickly or face death. When water levels are too low or rise too quickly while snail eggs are developing, apple snails do not flourish, affecting the many reptiles, mammals, and birds that feed on them. With regard to the ecology of trophic dynamics, or food chains, the 174 species of invertebrates play a vital role in the Everglades. Crayfish, insects, scorpions, and other invertebrates also support a web of animals. 
Question: What is the scientific name of the specific mollusk species that are the primary food of the limpkin and the endangered snail kite?
answer:

Pomacea paludosa.