Answer:
Mechanical Weathering
- caused by freezing and thawing of of water.  
- caused by the movement of agents such as glaciers and wind.
Chemical weathering
- caused by processes such as corrosion, hydrolysis and dissolution.
- caused by precipitation reacting with minerals in the rock.
- creates new substances such as clay and salts.
 
        
             
        
        
        
Answer:
it is b
the principle here is redundancy, if you need hammers at your work site to do something important you should make sure you have more than one around
same thing here only you don't lose or break the hammer the genes are mutated and you lose that amino acid
Explanation:
 
        
             
        
        
        
Sorry it would not let me nothing else
        
             
        
        
        
Any condition of unusual deposits of black pigment in different parts of the body is known as melanosis. 
This condition is a form of hyperpigmentation that is associated with increased melanin. Hyperpigmentation, which is manifested as darkening on the skin, can be caused by sun damage, inflammation, or skin injuries. <span>There are different types of melanosis such as Melanism, ocular melanosis, smoker's melanosis, oral melanosis, Riehl melanosis.</span>