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                                    Answer the following: [5 MARKS] 1) Why does topsoil have much more humus than subsoil? 2) What is the importance of humus to the soil? | 
                            
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Answer»  Answer the following: [5 MARKS] 1) Why does topsoil have much more humus than subsoil? 2) What is the importance of humus to the soil?  | 
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