It has four heart chambers, just like birds and mammals. 
        
                    
             
        
        
        
Paleontology, the study of fossils, supports evolution because the discovery of old life forms shows how new life evolved.
        
             
        
        
        
DNA contains the instructions needed for an organism to develop, survive and reproduce. To carry out these functions, DNA sequences must be converted into messages that can be used to produce proteins, which are the complex molecules that do most of the work in our bodies.