<h2>Answer:</h2>
If you go a bit overboard and feel a sudden pinch and you start bleeding, It means that something penetrate in your skin and torn off your blood vessel so that you start bleeding.
May be there was any pin or sharp needle thing was there in board that pinch into your skin and your epidermis could not resist that and it is no longer intact and you created a wound on your skin.
Epidermis the surface epithelium of the skin of an animal, overlying the dermis. and in this case it is wounded by that pin.
 
        
        
        
because they have have negligible mass            
 
        
             
        
        
        
Quantity of Heat = Mass x Heat Capacity x Temperature Change 
This may be shortened to: 
q = mcΔT 
where: 
q = Quantity of heat in Joules (J) m = Mass of the substance in grams (g) c = Specific Heat Capacity (Jg-1) ΔT = Change in Temperature (Δ = This symbol is "delta", which is Greek for "change") 
        
             
        
        
        
True. With time, effort, and the right tools, anything can be replicated.
        
                    
             
        
        
        
Phosphate 
Because it is the group of the molecules