One avenue to amend the Constitution includes all the following steps EXCEPT for which one? Amendment starts in Congress.
3/4 of the states must approve it.
2/3 of each House must approve it.
President signs it into law.

Amendment starts in Congress.

Explanation:

The process of amendment of the constitution may begin when;

The U.S. legislature form a two-thirds majority in both the Senate and the House of Representatives (congress) in favor of the proposed constitutional amendment;

Or

A national convention is called by Congress for for the purpose of constitutional amendment, when the legislatures of two-thirds of the states apply for the commencement of a constitutional amendment process.

The president signs the amendment into law at the end of the process. 3/4 of the states*about 38 out of 50 states) must approve the constitutional amendment.

We can see that constitutional amendment must not necessarily start in congress as explained above.

troy donahue,   i think.