[Q]: Question: "Aside from wind conditions or range expansion, what else might cause a bird to fly a longer distance than necessary when migrating?" Context: "Theoretical analyses show that detours that increase flight distance by up to 20% will often be adaptive on aerodynamic grounds - a bird that loads itself with food to cross a long barrier flies less efficiently. However some species show circuitous migratory routes that reflect historical range expansions and are far from optimal in ecological terms. An example is the migration of continental populations of Swainson's thrush Catharus ustulatus, which fly far east across North America before turning south via Florida to reach northern South America; this route is believed to be the consequence of a range expansion that occurred about 10,000 years ago. Detours may also be caused by differential wind conditions, predation risk, or other factors." Answer:
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[A]: predation risk

[Q]: Question: "How do you tell animals from men?" Context: "Waitz defined anthropology as "the science of the nature of man". By nature he meant matter animated by "the Divine breath"; i.e., he was an animist. Following Broca's lead, Waitz points out that anthropology is a new field, which would gather material from other fields, but would differ from them in the use of comparative anatomy, physiology, and psychology to differentiate man from "the animals nearest to him". He stresses that the data of comparison must be empirical, gathered by experimentation. The history of civilization as well as ethnology are to be brought into the comparison. It is to be presumed fundamentally that the species, man, is a unity, and that "the same laws of thought are applicable to all men"." Answer:
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[A]: comparative anatomy, physiology, and psychology

[Q]: Question: "How would a facedown tile beenfit a project?" Context: "The indirect method of applying tesserae is often used for very large projects, projects with repetitive elements or for areas needing site specific shapes. Tiles are applied face-down to a backing paper using an adhesive, and later transferred onto walls, floors or craft projects. This method is most useful for extremely large projects as it gives the maker time to rework areas, allows the cementing of the tiles to the backing panel to be carried out quickly in one operation and helps ensure that the front surfaces of the mosaic tiles and mosaic pieces are flat and in the same plane on the front, even when using tiles and pieces of differing thicknesses. Mosaic murals, benches and tabletops are some of the items usually made using the indirect method, as it results in a smoother and more even surface." Answer:
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[A]: gives the maker time to rework areas

[Q]: Question: "What does an invasion?" Context: "Southampton has been used for military embarkation, including during 18th-century wars with the French, the Crimean war, and the Boer War. Southampton was designated No. 1 Military Embarkation port during the Great War and became a major centre for treating the returning wounded and POWs. It was also central to the preparations for the Invasion of Europe in 1944." Answer:
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[A]:
military