<span>it comes and goes through the madreporite - a small valve like structure</span>
        
             
        
        
        
Less expensive source of energy is available.
hope this helped, please mark brainliest :)
 
        
                    
             
        
        
        
Answer:
D. Transport of oxygen through a placenta to a fetus.
Explanation:
Zygotes are fertilized egg cell, zygotes aren't produced in the ovaries but ovums or egg cells are produced in the ovaries. So option A is false.
Fertilization is internal not external in human. Option B is wrong.
Production of milk happens in the mammary gland (the breast) not in the reproductive system. Option C is false.
Transport of oxygen through a placenta to a fetus. The placenta is a vascular organ which is implanted in the wall of the uterus (a part of the female reproductive system) and links to the foetus through the umbilical cord. 
 
        
             
        
        
        
I believe passive transport is a form of diffusion. And it doesn't require any energy unlike active transport.