Answer:
I think its 1 cells all come from pre existing cells. have a nice day hope this isnt too late :)
Explanation:
 im taking the test too
 
        
             
        
        
        
Answer:
a. VIP (vasoactive intestinal peptide)
Explanation:
The enteric nervous system (ENS)  is one of the main divisions of the autonomic nervous system (ANS) together with sympathetic and parasympathetic nervous system. This system consists of neurons that regulate the function of the gastrointestinal tract (GI).
Inhibitory interneurons that are part of the enteric nervous system also known as Dogiel type I neurones achieve their inhibitory transmission via nitric oxide, adenosine triphosphate,  vasoactive intestinal peptide (VIP) and pituitary activating cyclic AMP. They usually act directly on smooth muscles of GI. 
 
        
             
        
        
        
Decreasing the number of double bonds, the resultant effect may be the SOLIDIFYING OF THE OIL AT ROOM TEMPERATURE.
 
        
             
        
        
        
Explanation:
C. Semi-Conservative
i believe this is the answer