Problem: The gut is generally an almost straight tube supported by the mesenteries (vertical partitions within segments), and ends with the anus on the underside of the pygidium. However, in members of the tube-dwelling family Siboglinidae the gut is blocked by a swollen lining that houses symbiotic bacteria, which can make up 15% of the worms' total weight. The bacteria convert inorganic matter – such as hydrogen sulfide and carbon dioxide from hydrothermal vents, or methane from seeps – to organic matter that feeds themselves and their hosts, while the worms extend their palps into the gas flows to absorb the gases needed by the bacteria.
What gases come from seeps?
The answer is the following: methane

Problem: By 17 May, the main Austrian army under Charles had arrived on the Marchfeld. Charles kept the bulk of his troops several miles away from the river bank in hopes of concentrating them at the point where Napoleon decided to cross. On 21 May, the French made their first major effort to cross the Danube, precipitating the Battle of Aspern-Essling. The Austrians enjoyed a comfortable numerical superiority over the French throughout the battle; on the first day, Charles disposed of 110,000 soldiers against only 31,000 commanded by Napoleon. By the second day, reinforcements had boosted French numbers up to 70,000. The battle was characterized by a vicious back-and-forth struggle for the two villages of Aspern and Essling, the focal points of the French bridgehead. By the end of the fighting, the French had lost Aspern but still controlled Essling. A sustained Austrian artillery bombardment eventually convinced Napoleon to withdraw his forces back onto Lobau Island. Both sides inflicted about 23,000 casualties on each other. It was the first defeat Napoleon suffered in a major set-piece battle, and it caused excitement throughout many parts of Europe because it proved that he could be beaten on the battlefield.
Around how many casualties did the French experience at the Battle of Aspern-Essling?
The answer is the following: 23,000

Problem: Hayek had a long-standing and close friendship with philosopher of science Karl Popper, also from Vienna. In a letter to Hayek in 1944, Popper stated, "I think I have learnt more from you than from any other living thinker, except perhaps Alfred Tarski." (See Hacohen, 2000). Popper dedicated his Conjectures and Refutations to Hayek. For his part, Hayek dedicated a collection of papers, Studies in Philosophy, Politics, and Economics, to Popper and, in 1982, said that "ever since his Logik der Forschung first came out in 1934, I have been a complete adherent to his general theory of methodology". Popper also participated in the inaugural meeting of the Mont Pelerin Society. Their friendship and mutual admiration, however, do not change the fact that there are important differences between their ideas.
Hayek dedicated many of his papers to Popper based on a dedication Popper made to him in which of his work?
The answer is the following: Conjectures and Refutations

Problem: Although the intensity of the bombing was not as great as prewar expectations so an equal comparison is impossible, no psychiatric crisis occurred because of the Blitz even during the period of greatest bombing of September 1940. An American witness wrote "By every test and measure I am able to apply, these people are staunch to the bone and won't quit ... the British are stronger and in a better position than they were at its beginning". People referred to raids as if they were weather, stating that a day was "very blitzy".:75,261 However, another American who visited Britain, the publisher Ralph Ingersoll, wrote soon after the Blitz eased on 15 September that:
With the intense bomb what did not happen as great as prewar predictions expected?
The answer is the following:
psychiatric crisis