Answer:
cell membrane, nucleus, and cytoplasm. 
Explanation:
A cell consists of three parts: the cell membrane, the nucleus, and, between the two, the cytoplasm. Within the cytoplasm lie intricate arrangements of fine fibers and hundreds or even thousands of very tiny, but distinct, structures called organelles.
 
        
             
        
        
        
They grow slow, It helps break the object down precisely as it's needed to be<span />
        
                    
             
        
        
        
Answer:
lunula
Explanation:
The lunula is crescent-shaped whitish colored area of bed of the nail.
<u>It is present at end of the nail.The lunula is not actually white in color but only appears white when it is seen through nail.  </u>
<u>Outlining nail matrix, lunula is extremely delicate part of structure of the nail. If one damages lunula, nail will be deformed permanently.</u>  
It appears whitish in color because of the  stratum basale obscures that underlies blood vessels.
 
        
             
        
        
        
I would say the answer would be D.
Because: If a river is dammed then there is little to no flow going downstream. This will effect the life downstream and also change its conditions. 
I Hope This Helped!