Select the correct answer from each drop-down menu. During the Crusades, Muslim forces repeatedly attacked the Christian Empire. In 1453, Constantinople fell to the Ottoman Empire. The city was renamed

Muslim forces repeatedly attacked the Christian Byzantine Empire.

In 1453, Constantinople fell to the Ottoman Empire. The city was renamed Istanbul

Explanation:

The crusades were arguably started because of the constant attacks of the Muslim forces on the Byzantine Empire. The Byzantine Empire is the medieval version of the Eastern Roman Empire, and as explained in the question, it was a christian state.

In 1453, after a long siege, the Seljuk Turks conquered Constantinople, which had been the Eastern Roman Empire for over 1,000 years. After the conquest, the Turks changed the name of the city to Istanbul.

i think it was   tsar alexander ii

the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.