Answer:
protein
Explanation:
because carbohydrate ..nucleic acids protein 
 
        
             
        
        
        
Shells are considered biotic because they come from living things. Biotic describes something living or use to be living such as plants and animals. So shells are considered biotic because they come from a living organism.
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Hope that helped:)
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Answer:
Somatic cells use mitosis 
Explanation:
somatic cells are body cells or skin cells