Answer:
Breath, heartbeat, and sunrise/sunset.
Explanation:
We constantly breathe and our heart beats as a rhythm of life.
The sunrises in the am and sets in the pm everyday to indicate morning and evening.
 
        
             
        
        
        
Milankovitch cycles occur every 2600 years
        
                    
             
        
        
        
It can also is the corrects answer
C