Excess Nitrates in the water supply
        
             
        
        
        
People with two copies of the sickle cell gene have the disease. People who carry only one copy of the sickle cell gene do not have the disease, but may pass the gene on to their children. Abnormal hemoglobin, called hemoglobin S, causes sickle cell disease (SCD). The problem in hemoglobin S is caused by a small defect in the gene that directs the production of the beta globin part of hemoglobin. This small defect in the beta globin gene causes a problem in the beta globin part of hemoglobin, changing the way that hemoglobin works.
        
             
        
        
        
Answer:
D.To promote open and profitable international trade 
 
        
                    
             
        
        
        
Unfortunately you didn't support your question with any options so that I could choose the correct one. But I am pretty sure I've got what you need so in eukaryotes, the components of the electron transport chain are located in the <span>inner mitochondrial membrane.</span>
        
             
        
        
        
They need to be capable of making proteins in that area