In the outer shell. So, A the outer level. 
I hope that this helps.
        
                    
             
        
        
        
It's controversial because the best source of stem cells is a human embryo (an aborted fetus).
        
                    
             
        
        
        
Answer:
cell membrane, nucleus, and cytoplasm. 
Explanation:
A cell consists of three parts: the cell membrane, the nucleus, and, between the two, the cytoplasm. Within the cytoplasm lie intricate arrangements of fine fibers and hundreds or even thousands of very tiny, but distinct, structures called organelles.
 
        
             
        
        
        
1. Overpopulation 
2. Ecosystem
3. Hunger & Sustainability
        
             
        
        
        
Answer:
B
Explanation:
Energy decreases as it moves up the levels.