How much of the earth's atmosphere do scientists believe was made of oxygen 2.3 billion years ago? a.) 70% b.) 22% c.) 1% d.) 10%

What does a movement along the demand curve show

Soweto was the site of one of the that swept across south africa in the late 1970s. in his effort to end apartheid, desmond tutu turned to . the united states responded to south africa’s apartheid policy in the 1980s by .

What is the main conflict in marriage is a private affair