The answer is:  Norovirus .
__________________________________________
        
             
        
        
        
C, exercise is the correct answer
        
             
        
        
        
<u>Volunteering</u> was the strongest predictor of lower risk for cardiovascular disease.
Explanation:
Many studies have proved that the  volunteering or helping others helps reduce risk factors of both cardiovascular disease and metabolic syndrome among older people.
It reduces hypertension, blood glucose levels, regulates lipid metabolism, and reduces central adiposity; all of which greatly reduces the incidence of cardiovascular diseases and metabolic disorders.  
Further, volunteering boosts the morale of a person; gives a sense of content, peacefulness and happiness; enhances communication, interaction and social skills; makes one to be calm and composed; and gives a great psychological strength; all of which reduces stress and anxiety which in turn helps to maintain a healthy heart.
 
        
             
        
        
        
Answer:
Skin is the largest organ and covers a surface area of 20 square feet. 
Explanation:
Skin has three layers the epidermis, the dermis and the hypodermis. the epidermis is the outermost layer and provides a water-proof barrier. The dermis contains hair follicles, connective tissue and sweat glands. The hypodermis is the subcutaneous deeper layer made up of connective tissue and fat. 
 
        
             
        
        
        
Answer:
B our enjoyment of nature