Answer:
 of the low pH of the vagina.
Explanation:
The pH of the vagina is maintained at highly acidic levels to prevent the germ buildup. The range of vaginal pH is around 3.8 to 4.5. The very low pH of the vagina creates a hostile environment for sperms and most of the sperms are killed as they enter the vagina due to the acidic pH. 
Apart from supplementing the sperms with energy, cervical mucus serves to protect the sperms from the hostile conditions of the vagina. The cervical mucus has an alkaline pH at or near the ovulation to protect sperms from acidic pH of the vagina and to facilitate fertilization. 
 
        
             
        
        
        
Answer:
In physical appearance can be changed by different DNA but for mental not very sure.But mental state can be altered when the DNA has anomaly or mutation. Mostly, people whom has high education always study hard for example students even they have physical problem but they still have good mental
 
        
                    
             
        
        
        
Answer:
NERVOUS AND ENDOCTRINE are activities that takes place in the cells 
 
        
                    
             
        
        
        
ATP
Explanation:
 ATP is produced in the cells and its conversion to energy is a single-step process.
 
        
                    
             
        
        
        
<span>Akathisia is the inability to sit still. People will tend to be uneasy and want to be doing something. They'll be fidgety, looking for something to do with their hands, or be looking to get up and walk around.</span>