Answer:
The Crusades were a series of religious wars between Christians and Muslims started primarily to secure control of holy sites considered sacred by both groups. In all, eight major Crusade expeditions occurred between 1096 and 1291. The bloody, violent and often ruthless conflicts propelled the status of European Christians, making them major players in the fight for land in the Middle East.
 
        
             
        
        
        
Answer:
B. Free-radical theory
Explanation:
The free radical theory statutes that <em>ageing is the result of the accumulation of the damage to cells and tissues caused by reactive oxygen species</em> as a result of aerobic metabolism. 
I hope you find this information useful and intresting! Good luck!
  
        
             
        
        
        
Answer:
I'm not sure if this a question or not but all the information on this is right except the last one. there are political parties in iran.
Explanation:
 
        
                    
             
        
        
        
Answer:
true                     
Explanation:
 Scientific management refers to management philosophy where workflows are analysed and metabolized. Its main aim is to improve economic efficiency, particularly the productivity of labor. 
It was one of the earliest attempts to apply science to process engineering and to management. For all the time being, the movement for scientific management produced revolutionary ideas — ideas like staff training, as well as the implementation of standardized best practices to increase productivity.
 Thus, from the above we can conclude that the given statement is true.