Please rephrase the question, it doesn't make sense.
        
             
        
        
        
 the Nucleus 
Explanation:
Known as the cell's “command center,” the nucleus is a large organelle that stores the cell's DNA (deoxyribonucleic acid). The nucleus controls all of the cell's activities, such as growth and metabolism, using the DNA's genetic information.
 
        
             
        
        
        
Cartilaginous fish do not contain any bones - their skeleton is made up of cartilage. 
        
             
        
        
        
Hi there.
I think the answer to your question is: nitrogen.
Nitrogen is found in proteins, but not carbs.
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Answer:
your answer would be C.Streak is tested by scraping a mineral across a streak plate.
Explanation:
Hope this helps have a great day