The extremely cold conditions during the 2014 "polar vortex" were due to the
the extremely cold conditions during the 2014 "polar vortex" were due to the
hadley cells.
monsoons.
ferrel cells.
rossby waves.
the jet stream.

Plz put the answer choices thx.

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

Bdef the answer rn t