What impact has geography and climate had on
the land and people of Africa?

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.

i believe the correct answer is b.

the constitution gives congress the power to regulate commerce "among" the several states.