How much of a majority is required for the u. s. senate and house to override a presidential veto?

The answer is two thirds vote in each Chamber.

Explanation:

During the process to override of a veto, each chamber of Congress votes on a bill vetoed by the President. To pass a bill over the president's objections requires a two-thirds vote in each Chamber.

what are the choices?

though both had similar roots, they both took these similar bases & formed it into their own way. both the byzantine empire and ancient roman have similar aspects, but each one made it unique. both the byzantine empire and ancient romans had roman influences which affected their culture