According to the fossil record, five took place, which lowered the variety of species found on earth today. a) mass clonings b) microevolutions c) mass extinctions d) mass revolutions

The answer would be (c), mass extinctions

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. 

Ithink its convection.hope this plz give brainliest!