What marked the end of the Byzantine Empire? The fall of the city of Rome to Odacer
The fall of Constantinople to the Ottoman Empire
The rise of the Russian Empire
The death of Justinian I

2

Explanation:

In 1453  the Ottomans surrounded Constantinople's ancient land wall for 55 days.

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.

a. competition between france and england for land and power