Which branch is checking the power of another?

Within the legislative branch, each house of Congress serves as a check on possible abuses of power by the other

Explanation:

a

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.