Which one of these took place first?
a) gutenberg bible printed
b) vasco da gama lands in india
c) genghis khan unites the mongols
d) henry viii declares himself leader of church of england

Genghis khan unites the Mongols  is the event which took place first.

Explanation:

Being from a humble family, Genghis Kahn became the leader of Mongols. He also conquers much of Asia and china. His empire extended to Syria, Vietnam, Poland and Korea. It is as large as the continent of Africa and many used to be killed and slaughtered mercilessly.  

He is also known to be famous when he provided religious freedom for his subjects and initiated the international postal system. He was named ‘Chinggis khan’ which when literally translated means ‘universal ruler’. He established a separate country called Mongolia.  

i think its toxic gasses but i could be wrong

the anasazi indians were real pioneers and created roads and irrigation systems for watering their crops. they were also great architects and the cliff dwellings are one of their biggest achievements.

explanation: