The andes are an extension of which two mountain chains in north america?

That would be the rocky and appalachians

 Appalachians and the rocky mountains are the two mountain chains in North America.

Answer meranesia;

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.