Answer:
In the absence of sunlight the plants which are dependent on sunlight for making food that is photosynthesis would die.
Also the people will suffer as sunlight is a good source of Vitamin D and in absence of sunlight they will not get it so easily. 
 
        
                    
             
        
        
        
Answer:
Mechanical barriers — which include the skin , mucous membranes , and fluids such as tears and urine — physically block pathogens from entering the body. Chemical barriers — such as enzymes in sweat , saliva , and semen — kill pathogens on body surfaces.
 
        
                    
             
        
        
        
<span>Secondary succession is faster than primary succession because the soil is already there and the soil usually contains many seeds.</span>
        
             
        
        
        
Answer:
There is no article attached 
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