Sand should be your answer because it contains 5,0 premeability variation
        
                    
             
        
        
        
Answer:
All your going to do is right down what you see and what it's doing for the first question and then if you have any questions does that awnser your question?
 
        
             
        
        
        
The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth. Carbon is the main component of biological compounds as well as a major component of many minerals such as limestone hope this helps you pls thank me 
^-^
        
             
        
        
        
I think it is carbohydrate metabolism