it can be further divided into epoch
 
        
                    
             
        
        
        
Answer:
Sun
Explanation:
The hydrological cycle is most like mainly propelled by solar energy. By evaporating water from the oceans, lakes, rivers, and even the surface, solar energy powers the cycle. Other water is lost from plants to the atmosphere resulting of the transpiration.
 
        
             
        
        
        
Pollution from a near by city is your answer ;D
        
             
        
        
        
There are exchanges that happen continuously in our bodies. One exchange is the gas exchange, or respiratory, system. This is the system where carbon dioxide is released from the lungs into the air, and oxygen is taken into the lungs from the air. This exchange happens in the air sacs of the lungs called the alveoli.
 
        
             
        
        
        
The first response when seeing a reduce visibility is to be cautious, slow down and reduce speed. It is because it is important to slow down as you can't see clearly and it could cause accidents when you are not careful as you drive and your driving way is not assisted with caution.