The nervous system sends messages from nerve endings to the brain and from the brain to cells, tissues, and organs. Cells of the nervous system sometimes secrete chemical messengers instead of neurotransmitters. These specialized nervous system cells are called neurosecretory cells, and they produce neurosecretions. Every nerve cells are long, thin cylinders along which electrical disturbances (nerve impulses) travel. the cell membrane of a typical nerve cell consists of an inner and an outer wall separated by a distance of 0.10 μm and the electric field within the cell membrane is 7.0×105n/c.
 
        
             
        
        
        
Answer:
As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level. 
Explanation:
Thin air exerts less pressure than air at a lower altitude.
 
        
             
        
        
        
Answer:
c
Explanation:
active transport does move nutrients to areas with concentraition they do this and its called active transport because the body is activly moving it to a different part
 
        
             
        
        
        
Helicase, DNA polymerase, Ligase and Primase. These are the ones we learned I don't know if there are more.
        
                    
             
        
        
        
Binary fission is for reproduction of a cell by division into two equals parts