The moon has different phases because it’s around different times. For example, let’s say you go outside and look at the moon at 11pm, then you go and look at it again at 12 pm, it’s going to have a different phase because it’s not at the say time.
I hope this helps! This is what I was getting from the question
        
             
        
        
        
Clean energy like solar wind and water
        
             
        
        
        
Answer:
Nitrogen fixing bacteria in the soil and within root nodules of some plants convert nitrogen gas on the atmosphere to ammonia.
Nitrifying- bacteria convert ammonia to nitrites.
 
        
             
        
        
        
A. They impede fish migration and spawning