There is no picture of the bird.
        
             
        
        
        
Hello.
The answer is 
<span>B.They help produce plasma cells. 
Have a nice day</span>
        
             
        
        
        
Objects with like charges repel/repulse each other while opposite charges attract each other
The direction of an electric fields is alway the direction electrons would naturally move. 
Not sure about the last one, my gut instinct is opposite.
        
             
        
        
        
A. Kidneys are the organs in the urinary system that produce urine after breaking it down from food.