Answer:
Big Bang, the universe is still expanding. Slowly the planets get further away from each other. It's the third planet from the sun, some believed that the earth was in the center of the universe  and now we believe the sun is in the middle.Explanation:
 
        
             
        
        
        
I believe it is A because Living things respond to changes, each and every living organism is  made up of cell and adapting to changes is same as responding to changes.So, only one left is A. 
        
             
        
        
        
Answer:
your not aloud to do tests on here or at least don't say that for next time.
Explanation:
 
        
                    
             
        
        
        
The correct answer should be the Periderm.
It is not as simple as this, of course and you would be wise to know that periderm is just a part of the overall concept that is bark, because bark is not a biological term.
        
                    
             
        
        
        
The bear affects the ecosystem by eating plants and animals which lowers invasive species levels.