Problem: Please answer a question about the following article about Annelid:
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 type of annelids are tube-dwelling?
A: Siboglinidae
Problem: Please answer a question about the following article about Bird:
The ability of birds to return to precise locations across vast distances has been known for some time; in an experiment conducted in the 1950s a Manx shearwater released in Boston returned to its colony in Skomer, Wales, within 13 days, a distance of 5,150 km (3,200 mi). Birds navigate during migration using a variety of methods. For diurnal migrants, the sun is used to navigate by day, and a stellar compass is used at night. Birds that use the sun compensate for the changing position of the sun during the day by the use of an internal clock. Orientation with the stellar compass depends on the position of the constellations surrounding Polaris. These are backed up in some species by their ability to sense the Earth's geomagnetism through specialised photoreceptors.
What do birds to compensate for the changing position of the sun during the day?
A: internal clock
Problem: Please answer a question about the following article about Umayyad Caliphate:
Many Muslims criticized the Umayyads for having too many non-Muslim, former Roman administrators in their government. St John of Damascus was also a high administrator in the Umayyad administration. As the Muslims took over cities, they left the peoples political representatives and the Roman tax collectors and the administrators. The taxes to the central government were calculated and negotiated by the peoples political representatives. The Central government got paid for the services it provided and the local government got the money for the services it provided. Many Christian cities also used some of the taxes on maintain their churches and run their own organizations. Later the Umayyads were criticized by some Muslims for not reducing the taxes of the people who converted to Islam. These new converts continues to pay the same taxes that were previously negotiated.
What tax collectors did the Umayyads often leave in place after they conquered regions?
A: Roman
Problem: Please answer a question about the following article about Israel:
The United States and the Soviet Union were the first two countries to recognize the State of Israel, having declared recognition roughly simultaneously. The United States regards Israel as its "most reliable partner in the Middle East," based on "common democratic values, religious affinities, and security interests". Their bilateral relations are multidimensional and the United States is the principal proponent of the Arab-Israeli peace process. The United States and Israeli views differ on some issues, such as the Golan Heights, Jerusalem, and settlements. The United States has provided $68 billion in military assistance and $32 billion in grants to Israel since 1967, under the Foreign Assistance Act (period beginning 1962), more than any other country for that period until 2003.
Who were the first two countries to recognize the State of Israel?
A:
United States and the Soviet Union