Stratospheric ozone destruction involves a complex series of reactions. These reactions begin with . O3 reacting with industrial sulfuric acid UV from sunlight reacting directly with O3 UV from sunlight being trapped in the troposphere O3 reacting directly with CFCs UV from sunlight causing Cl atoms to break free from CFCs

Answer after wwii, communist countries in eastern europe formed the warsaw pack, a military alliance, and comecon, an economic alliance;

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 the answer is either a , c or d