Answer:
atomic number or atomic mass 
 
        
                    
             
        
        
        
Answer:
true it is known as DNA mapping
 
        
             
        
        
        
<span>contractile vacuole
Contractile vacuoles are organelles that are responsible for excretion function. They perform osmoregulation which manages wastes, water and other needed materials in the cell. They are found in some prokaryoric organisms like the algae, protists, amoeba and other unicellular organisms. 
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