Respuesta :
The answer is: A roll call vote includes votes from Senators who are not in the chamber at the time of the vote.
roll call vote refers to a voting method which carried out by making each senators saying "yea" or "nay" to voice up their agreement or disagreement. This method of voting is only use if the quorum of senators want to make a voice record of each senators' voting. But this does not required for a bill to become a law.