Answer:
digestion
i think this is the answer
 
        
             
        
        
        
A Only one variable changed
        
             
        
        
        
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Answer:
Option A, transmit electrical impulses
Explanation:
Neuroglia also known as glial cells which act as supporting cells for the nervous system and its functioning. These cells surrounds the neurons and produce insulation between them as they produce myelin sheath that coats the axon. There are six types of neuroglia cells and they all work to provide essential nutrients to the neuron cell and also maintain the homeostasis (under which it also regulate the interstitial fluid composition and repair tissue framework) 
Hence option A is correct
 
        
                    
             
        
        
        
C!! i had this question before . energy decreases at top