Answer:
The spread of the bubonic plague from Central Asia into Europe decimated the populations but increased opportunities for the survivors. An enormous variety of new consumer goods, agriculture, weaponry, religion, and medical science became available in Europe.
How did they affect India?
The Mongol Empire launched several invasions into the Indian subcontinent from 1221 to 1327, with many of the later raids made by the Qaraunas of Mongol origin. The Mongols occupied parts of the subcontinent for decades.
Who stopped the Mongols?
the attack by the Golden Horde, was led by a grandson of Genghis Khan, ended abruptly in AD 1242 with their unexplained retreat from Hungary.
How many people did the Mongols kill?
40 million people. Hope this helps :D