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The bottom of the sea is lined with calcium carbonate, which comes from the shells of zooplankton that have died and sunk to the ocean floor. ... As a result, according to a study published recently in PNAS, parts of the seafloor are disintegrating.
        
             
        
        
        
Answer: It is True species richness grows twoards the poles  
 
        
             
        
        
        
Answer: Wetlands, animal digestion, along with thermogenic sources such as oil and gas production.
Explanation:
Methane (CH4)
Methane comes from natural sources, such as wetlands and animal digestion, along with thermogenic sources, including oil and gas production. Natural gas is approximately 90% methane. Hope this helped!
 
        
                    
             
        
        
        
B: They represent different concepts.
 
        
                    
             
        
        
        
Answer: Soil forms from weathered rocks and organic material. 
The rest of the statements are false. First, fertile soil usually forms in plains or lands with lower steepness of slope. Soil in steep slopes are prone to erosion. 
The O-horizon is made of material derived from trees (i.e. leaves, pine needles), decomposed materials and humus. 
Lastly, more living organisms in an area means more nutrients for the soil.