Please help im almost done but I’m stuck. I don’t understand

studies show tha in 7.5 billion years from now, the expanding sun will engulf, and destroy, the earth.

during the 20th century, the role of the vice president has evolved into more of an executive branch position. now, the vice president is usually seen as an integral part of a president's administration and presides over the senate only on ceremonial occasions or when a tie-breaking vote may be needed.

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.

c) he felt the constitution clearly gave states this right.