rhythm! :) 
rhythms are basically like a patterned recurrence, can be arranged any way you’d like it to be
        
             
        
        
        
The answer is gonna be A ecosystem
        
                    
             
        
        
        
Answer:
Un virus no es una célula sino un organismo microscópico que invade las células de sus huéspedes.
Explanation:
 
        
             
        
        
        
Answer:
B. In an area where a glacier has retreated
Explanation:
Primary succession, starts at a lifeless area where it has been affected by lava flood and/or retreated glacier therefore the answer is B.