Answer:
Carbon-13
Explanation:
Carbon have three isotopes. Isotopes are the atoms of the same element which has a different number of neutrons. Carbon has 3 isotopes.
Carbon-12 : 6 electrons I 6 protons I 6 neutrons
Carbon-13 : 6 electrons I 6 protons I 7 neutrons
Carbon-14 : 6 electrons I 6 protons I 8 neutrons
 
        
             
        
        
        
Answer:
Answer would be A, Muscles move your bones
Explanation:
Without the Muscular System, your bones would not be connected properly
 
        
                    
             
        
        
        
Answer:
 ATOMIC number of element A is 3
Explanation:
Atomic number is the same as number of protons of an element. 
according to the periodic table, Lithium is the element with 3 protons in its neutral state and it's atomic number is 3.