Answer:
a. The growing power of the nobility and the priesthood cause the decile and fall of the Old Kingdom.
Explanation:
I could only help with A. SORRY
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About 13,000 years ago, more than three-fourths of the large Ice Age animals, including woolly mammoths, mastodons, saber-toothed tigers and giant bears, died out. Scientists have debated for years over the cause of the extinction, with both of the major hypotheses — human overhunting and climate change — insufficient to account for the mega die-off.
Explanation:
Islamic mathematicians such as Al-Khwarizmi, Avicenna and Jamshīd al-Kāshī made advances in algebra, trigonometry, geometry and Arabic numerals. Islamic doctors described diseases like smallpox and measles, and challenged classical Greek medical theory.
The transcontinental railroad. Because of it, goods were able to be exchanged between the west and east and Chinese immigrants mainly worked on it.
