Answer:
A major factor in determining the mode of nitrogen excretion is the availability of water in the environment. Generally, aquatic animals excrete mostly ammonia, whereas terrestrial animals excrete either urea or uric acid.
Explanation:
 
        
                    
             
        
        
        
Answer:
The process by which green plants and some other organisms in the presence of sunlight to synthesize nutrients from carbon dioxide and water is called photosynthesis. 
 
        
                    
             
        
        
        
It is called peristalsis movement.
        
             
        
        
        
But what is the question are you like not sure about it or what 
 
        
             
        
        
        
Answer:
A sudden shortage of goods is called a shortage and happens for a variety of reasons in economics.