Answer:
B) Vectors
Explanation:
They are also called carriers.
 
        
             
        
        
        
The nervous system communicates through electrical impulses and the communication is very fast. It works in a relay fashion, from point to point comparable to the way the old telephones systems used to work.
The endocrine system communicates by chemical signals via the bloodstream. Hormones are secreted into the blood and extra cellular fluids, then transported to target cells, which must bear a receptor to be able to bind to a specific hormone, and respond.  
Hormones are chemical messengers secreted into blood or extracellular fluid that affect the function of other cells.
Endocrine communication is not quite as fast as the nervous system communication
 
        
             
        
        
        
Answer: Option B) Ovarian cancer
Explanation:
Just as breast and cervical cancer, ovarian cancer is exclusive to female humans.
Since, Mrs. Payne is a female, hence her ovaries should be screened for any cancerous growth. 
Thus, Ovarian cancer is the answer 
 
        
             
        
        
        
In a prokaryotic cell, transcription and translation are coupled; that is, translation begins while the mRNA is still being synthesized. In a eukaryotic cell, transcription occurs in the nucleus, and translation occurs in the cytoplasm.
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