Answer: "if" 
Explanation:
Signal words are referred to as the words that provide hints on what is expected to happen while one is reading. 
The signal word that points to the problem in the passage is "if". From the text, we can see that Hughes knew that the meat that comes from a single cow could not make many people sick buy that the real danger was "if" the disease was passed to other cows.
 
        
                    
             
        
        
        
Answer:
The trial is a structured process where the facts of a case are presented to a jury, and they decide if the defendant is guilty or not guilty of the charge offered. During trial, the prosecutor uses witnesses and evidence to prove to the jury that the defendant committed the crime(s).
 
        
                    
             
        
        
        
Answer: minerals are formed naturally by geological processes :)