A fertilized egg splitting into two embryoa
        
                    
             
        
        
        
The ecosystem is an ecological system consisting of all of its biotic and abiotic factors
 
        
                    
             
        
        
        
When an object turns around it’s internal axis (the earth turns on its axis) its a rotation. When an object turns around an external object (earth going around the sun) is a revolution.
        
                    
             
        
        
        
Explanation:
energy flows in only one direction through an ecosystem.
 
        
             
        
        
        
Answer:
-chemical composition...
:)