I want to say From the age 1 1/2 to the age 3 1/2 but I’m not sure
        
                    
             
        
        
        
Answer:
The three specialized systems routes are the coronary circulation, which brings blood to the myocardium; the portal circulation, which takes blood from the organs of digestion to the liver through the portal vein and the fetal circulation in which the fetus obtains oxygen and nutrients from the Mother's blood.
Explanation:
I majored in Health