Preserved footprints left behind by animals are called ichnites.
 
        
             
        
        
        
The seasons are caused by the tilt of the Earth's rotational axis. The answer is A
 
        
                    
             
        
        
        
Genetic code is a sequence of 3 letter word, known to be one after the another along the length of the DNA. 
 
        
             
        
        
        
Answer:
I thinks is pollution
Explanation:
its the only one that makes sense