Hello my friend, you is my friend, and we are friends.
        
             
        
        
        
Um. Yes? The braij is responsible for the nervous system. 
 
        
             
        
        
        
Answer: A
Explanation:
Decrease, Btw if I'm wrong I'm sry lol 
But I think it's A 
 
        
                    
             
        
        
        
Luminosity or magnitude of energy brightness
        
             
        
        
        
Answer:
I think the answer is the first option, more reliable and harder to use.
Explanation:
I think this because technology is expensive and the most reliable thing we have right now so the other options don't make sense.