The answer to this question would be D.) Permafrost prevents penetration of deep roots.
Hope this helped!
 
        
                    
             
        
        
        
<span>Osteoclasts
</span><span>Are derived from stem cells that produce macrophages
Secrete acids and protein-digesting enzymes</span>
        
             
        
        
        
Answer:
what cnidarians you need to spell right
 
        
             
        
        
        
Answer:
Option a) higher the average sea levels. 
Explanation: Carbondioxide is also known as greenhouse gas. When carbondioxide concentration is higher in the atmosphere, it prevents the reflected sunlight from going into the atmosphere which increases the temperature of the surrounding air. This phenomenon is called global warming. This increase in temperature starts melting of ice which are present on mountains and thus, increases sea level. 
 
        
             
        
        
        
The correct answer would be D), over millions of years, Pangaea broke apart and drifted to form the seven continents.