I think the answer is nervous system and muscular system work together but i could be wrong.
        
             
        
        
        
<em>Multiple births of as many as eight babies have been born alive.</em>
 
        
                    
             
        
        
        
I'd say D.
It's important to check first, then call, and care while you wait for your help to arrive.
Hope this helps,
-Tiara
        
                    
             
        
        
        
Protozoa-  
Cholera
Malaria
Amebic Dysentery
Fungi-
Ringworm
Athlete's foot
Histoplasmosis
Rickettsiae-
Typhus Fever
Rocky Mountain Spotted Fever
African Tick Bite Fever