A bill is a proposal for

A bill is a proposed new law introduced within a legislature that has not been adopted. Once a bill has become law, it is thereafter an act; but in popular usage the two terms are often treated as if they meant the same.

Explanation:

leonardo was the supreme renaissance painter, scientist, inventor, and polymath. da vinci is widely regarded as one of the greatest minds the world has ever produced. he was interested in everything from music to art and science. da vinci was an immense creative force at the start of the renaissance period. amongst his many works was the immortal painting – the mona lisa.

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a system of cooperative federalism emerged, as the powers of the federal government expanded.