Answer:
A is pointing to the cell membrane. The cell membrane's main function is to provide protection for the cell as well as allow substances in and out of the cell due to selective permeability. 
Explanation:
Some other functions:
-Endocytosis and Exocytosis
-Cell Signaling
 
        
             
        
        
        
Answer:
OH HELL NAW NOT A WHOLE LONG ASH QUESTION PAGE
Explanation:
 
        
                    
             
        
        
        
Domain of unicellular prokaryotes that have cell walls containing peptidoglycan; corresponds to the kingdom Eubacteria. Domain consisting of unicellular prokaryotes that have cell walls that do not contain peptidoglycan; corresponds to the kingdom Archaebacteria.
        
             
        
        
        
The rivers discharge is usually greatest at the mouth.
:D hope this helps
        
                    
             
        
        
        
Paleontologists have found fossil evidence of various “walking whales,” semiaquatic whales that show some early stages of the transition from land-dwelling ancestors to today’s familiar fully marine whales. One such “walking whale” is Ambulocetus (am-bew-lo-SEAT-us ...