Which statements correctly describe travel in the thirteenth century? A, Travelers used a variety pack of animals, including camels, horses, and yaks.
B, Merchants, more than anyone else, undertook long-distance travel.
C, Travel by land was hazardous because of difficult terrain.
D, Merchants traveled by sea from Italy to China through the Seuz Canal.
E, Many people traveled by ship because water routes were well known at the time.
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the andes or andean mountains (spanish: cordillera de los andes) are the longest continental mountain range in the world, forming a continuous highland along the western edge of south america. this range is about 7,000 km (4,300 mi) long, about 200 to 700 km (120 to 430 mi) wide (widest between 18° south and 20° south latitude), and of an average height of about 4,000 m (13,000 ft). the andes extend from north to south through seven south american countries: venezuela, colombia, ecuador, peru, bolivia, chile and argentina.

from wikipedia

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power       the answer is a

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the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).