I believe the answer is C.
        
                    
             
        
        
        
The organism that was most likely to live at the same time as brachiopods were
Trilobites
 
        
             
        
        
        
The answer is B, higher high tides. Because in the passage it states: "Because the tides seem to spring up."
        
             
        
        
        
The answer to the question "Upon realizing that your remote is not working even after replacing the batteries you decided to use, this process is called the experiment. You are experimenting on what would happen to the remote if you are going to change the batteries, if it is going to work or not.