Answer:
Both the Byzantine and Islamic empires rose at the demise of the Roman Empire. The most notable difference between the two was their religious practices. The Byzantine Empire consisted of Orthodox Christians the Arab (Muslims) empires were engulfed in Islam. Although different, both religions had similar tenants.
The answer is D. Tom thumb
So if the vice president (president of the Senate) isn’t present, the president pro tempore (senator who’s been there the longest from the majority party) will take over.