Answer:
Its "No, eukaryotic cells cannot live without
mitochondria and chloroplasts; they provide
the energy cells need to survive."
Explanation:
Hoped this helped, have a great day
Brainlist? 
 
        
             
        
        
        
Because it determines if it is isolated or not.  This means if other substances can enter or not.  This usually relies on the membrane with it´s pores.  The pores help the membrane be selectively permeable in what it lets in and out.
        
             
        
        
        
The direct source of energy to move the sailboat is probably wind, since wind is what pushes the sail of the sailboat, which is what propels the sailboat forward. 
Hope this helps!
        
             
        
        
        
C. The problem of endangered species