A bone cell, formed when an osteoblast becomes embedded in the matrix it has secreted.
        
             
        
        
        
Answer:
A
Explanation:
An isolated system can NOT exchange energy or matter with it's surroundings. This is why it is isolated.
 
        
             
        
        
        
Answer:
Making an area unavailable to plants and animals
Explanation:
 
        
                    
             
        
        
        
The greenhouse effect.
Hope this helps!
-Payshence xoxo