A man's lack of instinct.
Also by studies.
        
             
        
        
        
Answer:
12 Technological Advancements of World War I
    Tanks. In 1914, the “war of movement” expected by most European generals settled down into an unexpected, and seemingly unwinnable, war of trenches. ...
    Flamethrowers. ...
    Poison Gas. ...
    Tracer Bullets. ...
    Interrupter Gear. ...
    Air traffic control. ...
    Depth Charges. ...
    Hydrophones.
Explanation:
 
        
                    
             
        
        
        
Since media res starts right in the middle of the action, it captures the reader’s attention immediately.
        
             
        
        
        
insert a semicolon in between the independent clauses
is your answer