A.Nylon because nylon is a chemical that is bad if you put it on your skin when it's cold
 
        
                    
             
        
        
        
Leg curls are focused on the muscles of the lower leg or hamstrings. Hamstrings are the largest calf muscles which should be exercised and trained frequently. Leg curls can be performed by a lying position. Leg curls should be done properly because, sometimes leg curls can cause back pains and lower back pain.
        
             
        
        
        
The term Pharmacologic should be used to describe a classification based on mechanism of action.
<h3>What is 
Pharmacologic?</h3>
As a branch of basic science which draws on information and abilities from physiology, biochemistry, cell & molecular biology, and other fields, pharmacology is frequently referred to as the "bridge science." To rationally construct treatments, pharmacologists are able to "translate" such knowledge. 
Pharmacologists can provide a distinctive viewpoint when addressing issues relating to drugs, hormones, and chemicals as a result of their multidisciplinary training.
Pharmacologists have access to a wide range of research opportunities because the area is interdisciplinary, which is not true of other branches of knowledge. People are drawn to careers in pharmacology because of this flexibility and the opportunity for practical application of research.
Learn more about pharmacology 
brainly.com/question/2578609
#SPJ4
 
        
             
        
        
        
A risk behavior is a behavior that carries some form of risk. In the case of teenagers and health risk this can include habits that can be particularly dangerous toward their and other now and future health. protected sex for example is a risky behavior which could cause STD infections. 
Being knowledgeable about risk behaviors is a requirement in order to keep teens safe, and develop solutions to such dangers. 
        
                    
             
        
        
        
Undergo a thorough physical exam to make sure that the persons heart, lungs, and physical body can with stand the demands of vigorous excercise.