Nomadic travelers in central and east Asia were able to survive the harsh conditions of the tundras by adapting to the harsh environment that is engulfing the area or region. Also they keep moving with their hut or shelter and also may uses oxen for transportation and carrying logistics.
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The answer is a. //too short
Economic growth and development
In a time before railroads and highways, the Great Lakes and St. Lawrence River served as the primary transportation system. Many of North America's largest cities were established along the waterway as commerce flourished between their ports. Today, Great Lakes-Seaway shipping is equally important.
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The Deccan plateau is a topographically variegated region located south of the Gangetic plains -the portion lying between the Arabian Sea and the Bay of Bengal- and includes a substantial area to the north of the Satpura Range, which has popularly been regarded as the divide between northern India and the Deccan. The plateau is bounded on the east and west by the Ghats, while its northern extremity is the Vindhya Range. The Deccan's average elevation is about 2,000 feet (600 m), sloping generally eastward; its principal rivers, the Godavari, Krishna, and Kaveri, flow from the Western Ghats eastward to the Bay of Bengal. Tiruvannamalai in Tamil Nadu is often regarded as the Southern gateway of Deccan plateau.
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