Answer:
The presence of the nucleus!
Explanation:
Since it is a Bacteria, they do not have a nuclei. But eukaryotes do. 
Both can reproduce(tip: Bacteria is asexual meaning it can reproduce by itself), has a membrane and have ribosomes
 
        
             
        
        
        
Answer:
most likely b, a population is many living with each other and not just one species 
 
        
             
        
        
        
Only bacteria can reproduce outside a host and bacteria are not dependent on a host
        
                    
             
        
        
        
The answer is: Chloroplasts.