During the period of the crusades, warfare between christians and muslims lasted nearly: 300 years 100 years 500 years 200 years

Option: 200 Years

Explanation:

The Crusades were the series of war between the Christians and Muslim, where Christians tried to recover their Holy Land in the Middle East and to stop Muslim from spreading its territories in 11th to 13th century. There were at least eight crusades, the first crusade started in 1096 and it ended in eighth crusade in 1270.

food chain i would say only because there is competition on getting food and survival

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.