Answer:
Explanation:An example of such a substance is table salt. The chemical formula for table salt is NaCl. ... That there are no numbers present in the chemical formula means that there is one atom of each element present in the molecule. The Periodic Table reveals that Na is the symbol for sodium, and Cl is the symbol for chlorine.
 
        
             
        
        
        
Because there is genetic variation among the newly reproduced organism.
        
             
        
        
        
Answer:
3. fats 
Explanation:
fats are in the food used by animal cells, fats and lipids can be used for things such as storing energy in the cells 
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Enzymes are large molecules that speed up the chemical reactions inside cells. Each type of enzyme does on specific job. Enzymes are a type of protein, and like all proteins<span>, they are made from long chains of different </span>amino acids<span>.</span>
        
                    
             
        
        
        
<span>Most of the nitrogen gas in Earth's atmosphere comes from _____.
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D.	the breakdown of carbon dioxide</span>