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 is a contact method of checking surface roughness for values greater than. 2µ”.</span>
        
             
        
        
        
Schemas refers to a cognitive frame work which help humans to organize and give interpretations to information obtained both from within and from the external enviroment. Schema guide human cognitive processes and behaviour. Schema helps in structuring our memories by acting as a glue which hold all the information we have gathered together. Shcema is used in recognizing new experience and in relating it with old experiences. Schema affects humans' perception, encoding, memory recall, etc.
        
                    
             
        
        
        
Answer:
guanine, adenine, cytosine, 
Explanation:
 
        
                    
             
        
        
        
D) Contour plowing is used to reduce erosion and sediment pollution.
Explanation:
Contour plowing in farming helps to prevent pollution by reducing surface erosion of topsoil and preventing sediment pollution. 
Contour plowing is a farming technique in which crops are planted along the slopes of hills or contoured areas. 
- The rate at which rain water and precipitation moves along slope terrain is very fast. 
- This causes the washing off of the the topsoil on hills to eroded very fast. 
- Contour plowing breaks the slope and farming is done along movement on the contour. 
- This prevents topsoil erosion. 
- It also prevents sediment pollution in nearby streams and water bodies that are located around the valley at the base of the hill. 
Learn more: 
Soil erosion brainly.com/question/2473244
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