I think its harmful, because its unhealthy for workers and its harmful to the environment and to the people. Its also a waste of water and it pollutes the air. 
hope that i helped and sorry if i was too late. 
 
        
             
        
        
        
It is the scrotum, indeed.
        
                    
             
        
        
        
Answer:
Explanation: Trophic level, also called feeding level, is defined as the feeding level or each stage in a food chain or food web. In other words, trophic level is the number of links by which food energy is transferred from producers to final consumers. For example, in a food chain like the one below, we can have these levels.
 
        
                    
             
        
        
        
Answer:
A. Valine has replaced glutamic acid 
Explanation: 
hope this helps:)