Answer:
stress can be very harmful to  our helath it can cause depression 
Explanation:
 
        
             
        
        
        
Out of the following choices, the best treatment for a virus is is an antibiotic. However, most virus's can't be treated with an antibiotic and will be treated with over the counter remedies. 
        
                    
             
        
        
        
Answer:
The skin
Digestive tract 
Vagina
Mucous membrane 
Explanation:
The skin prevents microbes from entering the body 
Digestive tract e.g. stomach acid is a natural defence mechanism 
The vagina is acidic and this prevents harmful bacteria from growing with it's own flora. 
Mucous membranes e.g. lining of the mouth, nose, eyelids are all defense mechanisms. 
 
        
             
        
        
        
Sylvia is unable to climb stairs as quickly as she used to
 
        
             
        
        
        
Explanation:
Doctors having training in physiotherapy(physios) as well as sports medicine should attend to Coltens injury. As certain injuries like this one, are very common among sports professionals, Sports medicine training easily allows the doctors to judge the type of injury undertaken and the method of treatment required. 
As Colten needs rehabilitation , a physiotherapist is a must for this purpose as physiotherapy is the best way of rehabilitation amongst athletes.