Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
What drove circadian rhythms to evolve has been an enigmatic question. Previous hypotheses emphasized that photosensitive proteins and circadian rhythms may have originated together in the earliest cells, with the purpose of protecting replicating DNA from high levels of damaging ultraviolet radiation during the daytime. As a result, replication was relegated to the dark. However, evidence for this is lacking, since the simplest organisms with a circadian rhythm, the cyanobacteria, do the opposite of this - they divide more in the daytime. Recent studies instead highlight the importance of co-evolution of redox proteins with circadian oscillators in all three kingdoms of life following the Great Oxidation Event approximately 2.3 billion years ago. The current view is that circadian changes in environmental oxygen levels and the production of reactive oxygen species (ROS) in the presence of daylight are likely to have driven a need to evolve circadian rhythms to preempt, and therefore counteract, damaging redox reactions on a daily basis.
What developed to protect replicating DNA from ultraviolet radiation and night?
A: unanswerable

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Simultaneous videoconferencing among three or more remote points is possible by means of a Multipoint Control Unit (MCU). This is a bridge that interconnects calls from several sources (in a similar way to the audio conference call). All parties call the MCU, or the MCU can also call the parties which are going to participate, in sequence. There are MCU bridges for IP and ISDN-based videoconferencing. There are MCUs which are pure software, and others which are a combination of hardware and software. An MCU is characterised according to the number of simultaneous calls it can handle, its ability to conduct transposing of data rates and protocols, and features such as Continuous Presence, in which multiple parties can be seen on-screen at once. MCUs can be stand-alone hardware devices, or they can be embedded into dedicated videoconferencing units.
What is one type of simultaneous call that acts as a bridge?
A: unanswerable

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Owing to economic conditions and the late 2000s recession, many of the proposed mega casinos never went further than the initial planning stages. One of these developers was Pinnacle Entertainment, who purchased the Sands Atlantic City, only to close it permanently November 11, 2006. The following year, the resort was demolished in a dramatic, Las Vegas styled implosion, the first of its kind in Atlantic City. While Pinnacle Entertainment intended to replace it with a $1.52 billion casino resort, the company canceled its construction plans and plans to sell the land. The biggest disappointment was when MGM Resorts International announced that it would pull out of all development for Atlantic City, effectively ending their plans for the MGM Grand Atlantic City.
Why did many of the proposed mega casinos never get further than the initial planning stages?
A: economic conditions and the late 2000s recession

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The Republic of Cyprus has de jure sovereignty over the island of Cyprus and its surrounding waters, according to international law, except for the British Overseas Territory of Akrotiri and Dhekelia, administered as Sovereign Base Areas. However, the Republic of Cyprus is de facto partitioned into two main parts; the area under the effective control of the Republic, comprising about 59% of the island's area, and the north, administered by the self-declared Turkish Republic of Northern Cyprus, which is recognised only by Turkey, covering about 36% of the island's area. The international community considers the northern part of the island as territory of the Republic of Cyprus occupied by Turkish forces. The occupation is viewed as illegal under international law, amounting to illegal occupation of EU territory since Cyprus became a member of the European Union.
What does the international community consider the northern part of Cyprus?
A:
territory of the Republic of Cyprus occupied by Turkish forces