Why drill should be performed in single beat?​

Any.

Explanation: A drill can be defined as “instruction by means of repeated exercises”

i believe the answer is a

delegated (sometimes called enumerated or expressed) powers are specifically granted to the federal government in article i, section 8 of the constitution. this includes the power to coin money, to regulate commerce, to declare war, to raise and maintain armed forces, and to establish a post office.