False, mass number is protons plus neutrons. not subtraction.
        
             
        
        
        
<span>The Answer is D. Maintaining Structure</span>
        
                    
             
        
        
        
I attached the answer, but you picture is empty.
 
        
        
        
Answer:
Possible blood type of their children is type A and type B blood
Explanation:
A person can have type A, type B, type AB or type O blood. 
A woman who has type AB blood marries a man with type O blood.
 Parents                        AB     x     OO
Possible genotypes        AO     BO
Possible blood type of their children is type A and type B blood