Problem: Textual criticism:

When comparing different documents, or "witnesses", of a single, original text, the observed differences are called variant readings, or simply variants or readings. It is not always apparent which single variant represents the author's original work. The process of textual criticism seeks to explain how each variant may have entered the text, either by accident (duplication or omission) or intention (harmonization or censorship), as scribes or supervisors transmitted the original author's text by copying it. The textual critic's task, therefore, is to sort through the variants, eliminating those most likely to be un-original, hence establishing a "critical text", or critical edition, that is intended to best approximate the original. At the same time, the critical text should document variant readings, so the relation of extant witnesses to the reconstructed original is apparent to a reader of the critical edition. In establishing the critical text, the textual critic considers both "external" evidence (the age, provenance, and affiliation of each witness) and "internal" or "physical" considerations (what the author and scribes, or printers, were likely to have done).

Identical documents that represent different text are called what?
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A: unanswerable


Problem: Epigenetic changes in eukaryotic biology serve to regulate the process of cellular differentiation. During morphogenesis, totipotent stem cells become the various pluripotent cell lines of the embryo, which in turn become fully differentiated cells. A single fertilized egg cell, the zygote, gives rise to the many different plant cell types including parenchyma, xylem vessel elements, phloem sieve tubes, guard cells of the epidermis, etc. as it continues to divide. The process results from the epigenetic activation of some genes and inhibition of others.
How are the different cells formed?
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Answer: continues to divide


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Yaroslav, known as "the Wise", struggled for power with his brothers. A son of Vladimir the Great, he was vice-regent of Novgorod at the time of his father's death in 1015. Subsequently, his eldest surviving brother, Svyatopolk the Accursed, killed three of his other brothers and seized power in Kiev. Yaroslav, with the active support of the Novgorodians and the help of Viking mercenaries, defeated Svyatopolk and became the grand prince of Kiev in 1019. Although he first established his rule over Kiev in 1019, he did not have uncontested rule of all of Kievan Rus' until 1036. Like Vladimir, Yaroslav was eager to improve relations with the rest of Europe, especially the Byzantine Empire. Yaroslav's granddaughter, Eupraxia the daughter of his son Vsevolod I, Prince of Kiev, was married to Henry III, Holy Roman Emperor. Yaroslav also arranged marriages for his sister and three daughters to the kings of Poland, France, Hungary and Norway. Yaroslav promulgated the first East Slavic law code, Russkaya Pravda; built Saint Sophia Cathedral in Kiev and Saint Sophia Cathedral in Novgorod; patronized local clergy and monasticism; and is said to have founded a school system. Yaroslav's sons developed the great Kiev Pechersk Lavra (monastery), which functioned in Kievan Rus' as an ecclesiastical academy.
Who was Yaroslav's father?
A: Vladimir the Great


Context and question: Though there is no doubt that the demographic crisis of the 14th century caused a dramatic fall in production and commerce in absolute terms, there has been a vigorous historical debate over whether the decline was greater than the fall in population. While the older orthodoxy held that the artistic output of the Renaissance was a result of greater opulence, more recent studies have suggested that there might have been a so-called 'depression of the Renaissance'. In spite of convincing arguments for the case, the statistical evidence is simply too incomplete for a definite conclusion to be made.
What is the alternative to the theory that the Renaissance was a time of no opulence?
Answer: unanswerable


Question: An unauthorized user gaining physical access to a computer is most likely able to directly download data from it. They may also compromise security by making operating system modifications, installing software worms, keyloggers, or covert listening devices. Even when the system is protected by standard security measures, these may be able to be by passed by booting another operating system or tool from a CD-ROM or other bootable media. Disk encryption and Trusted Platform Module are designed to prevent these attacks.
Is there an answer to this question: How are computers made secure?

Answer: unanswerable


Question: When Link enters the Twilight Realm, the void that corrupts parts of Hyrule, he transforms into a wolf.[h] He is eventually able to transform between his Hylian and wolf forms at will. As a wolf, Link loses the ability to use his sword, shield, or any secondary items; he instead attacks by biting, and defends primarily by dodging attacks. However, "Wolf Link" gains several key advantages in return—he moves faster than he does as a human (though riding Epona is still faster) and digs holes to create new passages and uncover buried items, and has improved senses, including the ability to follow scent trails.[i] He also carries Midna, a small imp-like creature who gives him hints, uses an energy field to attack enemies, helps him jump long distances, and eventually allows Link to "warp" to any of several preset locations throughout the overworld.[j] Using Link's wolf senses, the player can see and listen to the wandering spirits of those affected by the Twilight, as well as hunt for enemy ghosts named Poes.[k]
Is there an answer to this question: What does Link transform into when he enters the Twilight Realm?

Answer:
Wolf