Very simple. At rest, you have a number of bpm. After exercise, the heart can't return abruptly to the rest speed, and it keeps a faster rate for a while.
 
        
             
        
        
        
The answer would be letter B.
 
        
                    
             
        
        
        
The answer to this question is the term vegetation. A vegetation are the plants that are found and covering a particular area or location. Vegetation is also known as the plant community. Natutal vegetation is the plant life where in it lives without the interruption of humans.
        
             
        
        
        
C, It causes the cell membrane to rupture.
 
        
             
        
        
        
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Generally speaking, penguins are BIRDS, in other words, AVES. 
☞ I hope that you find my answer useful.