Answer: c. molecular structure of DNA
        
             
        
        
        
I would say b but then again im not really sure so...
        
             
        
        
        
Answer: D
Explanation:
During embryogenesis, hematopoiesis begins in week 3 in the Yolk Sac, in Pander´s Island or Wolff´s Island, commonly known as the "blood islands". These blood islands develop from the umbilical vesicle, allantois, and chorion. In week 5, blood production starts on the fetal liver, and finally, at week 12 it begins in the bone marrow, spleen and, thymus. 
 
        
             
        
        
        
Answer:
depends on what you`re asking
In a cell: The Vacuole
In the body: Osmosis