B. they are single molecules...
        
             
        
        
        
The answer would be B i believe<span>(a protease) begins the chemical digestion of protein</span>
        
             
        
        
        
Answer:
Prokaryotic cells reproduce by a process that is called binary fission. 
Explanation:
The DNA in such cells is contained in a single circular chromosome called a plasmid within the cytoplasm. The reproductive process starts with the replication of the chromosome.
 
        
                    
             
        
        
        
B Carbón dioxide 
Not sure