Protein Kinase
Hope this helps xox :)
        
             
        
        
        
I think the correct answer from the choices listed above is option A. The main function of  structural adaptations is that they  help the organism survive in its environment. These adaptations are physical features of an organism like the bill on a bird or the fur on a bear.
        
             
        
        
        
<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.
 
        
        
        
Answer:
Bacteria that  metabolize NO2- to give rise to NH4+ belongs to the family of denitrifying bacteria and nitrate ammonification bacteria such as pseudomonas.
Explanation:
Denitrifying bacteria uses NO2- as electron aceeptor thus converting the nitrite ion (NO2-) to ammonium ion(NH4+).
                a) The above reaction is a reduction reaction because NO2- or nitrite ion accept electron to generated its reduced form known as ammonium(NH4+).
              b)  NO2- acting as electron acceptor in this reaction.