B. Deposition 
Deposition is the dropping of sediment by wind, water, ice, or gravity.
 
 
        
                    
             
        
        
        
DNA was found to contain only four different chemical building blocks. 
        
             
        
        
        
A control group is different because it is not what is being tested. for example the control group would use sugar pills while the other group uses the pills being tested
        
             
        
        
        
Answer: through the process of photosynthesis
Explanation:
 carbon dioxide is pulled from the air to produce food made from carbon for plant growth. Carbon moves from plants to animals. Through food chains, the carbon that is in plants moves to the animals that eat them. Animals that eat other animals get the carbon from their food too.