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Shoen holders had access to manpower and, as they obtained improved military technology (such as new training methods, more powerful bows, armor, horses, and superior swords) and faced worsening local conditions in the ninth century, military service became part of shoen life. Not only the shoen but also civil and religious institutions formed private guard units to protect themselves. Gradually, the provincial upper class was transformed into a new military elite based on the ideals of the bushi (warrior) or samurai (literally, one who serves).
What institutions were forbidden to form private guards?
A: unanswerable

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In 1854 president Antonio Lopez de Santa Anna enlarged the area of the Federal District almost eightfold from the original 220 to 1,700 km2 (80 to 660 sq mi), annexing the rural and mountainous areas to secure the strategic mountain passes to the south and southwest to protect the city in event of a foreign invasion. (The MexicanAmerican War had just been fought.) The last changes to the limits of the Federal District were made between 1898 and 1902, reducing the area to the current 1,479 km2 (571 sq mi) by adjusting the southern border with the state of Morelos. By that time, the total number of municipalities within the Federal District was twenty-two.
What is the current area of Mexico City?
A: 1,479 km2 (571 sq mi)

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Copper, silver and gold are in group 11 of the periodic table, and they share certain attributes: they have one s-orbital electron on top of a filled d-electron shell and are characterized by high ductility and electrical conductivity. The filled d-shells in these elements do not contribute much to the interatomic interactions, which are dominated by the s-electrons through metallic bonds. Unlike metals with incomplete d-shells, metallic bonds in copper are lacking a covalent character and are relatively weak. This explains the low hardness and high ductility of single crystals of copper. At the macroscopic scale, introduction of extended defects to the crystal lattice, such as grain boundaries, hinders flow of the material under applied stress, thereby increasing its hardness. For this reason, copper is usually supplied in a fine-grained polycrystalline form, which has greater strength than monocrystalline forms.
How is copper normally supplied?
A: fine-grained polycrystalline form

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After Mary continued in the "blood of her purifying" another 33 days for a total of 40 days, she brought her burnt offering and sin offering to the Temple in Jerusalem,[Luke 2:22] so the priest could make atonement for her sins, being cleansed from her blood.[Leviticus 12:1-8] They also presented Jesus "As it is written in the law of the Lord, Every male that openeth the womb shall be called holy to the Lord" (Luke 2:23other verses). After the prophecies of Simeon and the prophetess Anna in Luke 2:25-38 concluded, Joseph and Mary took Jesus and "returned into Galilee, to their own city Nazareth".[Luke 2:39]
Who was presented at the Temple in Jerusalem?
A:
Jesus