Question

Which of the following was the most significant contribution made by John Adams to the U.S. Constitution? formation of a bicameral legislature formation of a unicameral legislature formation of a federal veto program formation of a Supreme Court

Answer 1

The answer would be the creation of the bicameral which is. 
 This distributes the representatives into two distinct assemblies, chambers, or houses. 

Answer 2

Formation of a bicameral legislature