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                              Q:
                           
                           
                                                      | A) oxygen, nitrogen, carbon, hydrogen, sulfur, and phosphorus | B) carbon, potassium, iron, magnesium, hydrogen, and nitrogen | 
| C) hydrogen, carbon, calcium, potassium, oxygen, and phosphorus | D) oxygen, calcium, phosphorus, sodium, hydrogen, and carbon | 
                              Answer:   A) oxygen, nitrogen, carbon, hydrogen, sulfur, and phosphorus
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
Living organisms often contain trace amounts of several elements, but the most abundant ones are oxygen, carbon, hydrogen, nitrogen, calcium, sulphur and phosphorus.
 
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