Answer: black (graphite), transparent (diamond)
Explanation:
 
        
                    
             
        
        
        
Fixator (--) helps hold a bone in place
        
             
        
        
        
Answer:
c. Cr. N. IV = trochlear nerve
Explanation:
The IV cranial nerve is the trochlear nerve. It is located on the dorsal side of the brain near the back. It is a motor nerve and the smallest nerve which serves eye. This nerve present in the superior oblique muscle of the eye. The superior oblique muscle controls the rotational movement of the eyeball  and prevent the eyeball from rolling upward into the eye socket.
 
        
             
        
        
        
They melt the shale and then it transforms into a crude, it takes place in rocks.
        
             
        
        
        
Remember that a controlled variable is a variable that stays the same thoughout the experiment.
it wouldn't be a. because two different wires were used
the final length of the wax would be your dependent variable, so it wouldn't be c.
the thermal conductivity is the independent variable so it isn't d.
the original length of the wax was the same for both.
So B is your answer.