Answer:
leaches
Explanation:
I am taking human geography in high school and I got this exact question.
Earth is mostly made of rock.
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.
Hope this helps :))