Answer:
D
Explanation:
as air passes through your system it is filtered, warmed and moistened because of you need that to breath. 
 
        
             
        
        
        
The correct answer is letter C. Ballistic stretches are very impractical for exercisers. This involved sudden bouts of stretching and relaxing of the muscle groups in the body. It is only advisable to perform this type of stretching when an individual is an athlete or an elite player. 
        
                    
             
        
        
        
Answer:
This is sometimes called knee valgus, valgus collapse, or some combination of the two.
Explanation:
 
        
             
        
        
        
Answer:
he simply means he should try harder and probably he is not feeling well
 
        
             
        
        
        
Answer:
CONSUMER BEHAVIOUR 
Explanation:
Consumer behaviour is the study of consumer's emotional, mental and behavioural responses and how customers buy and use goods and services to satisfy their needs and wants. 
The actions or mood of consumers and the reason for the mood are important in the marketplace.
Therefore understanding and keeping track of consumer behavior or mood is important for businesses because it influence the purchasing behavior of a consumer. The secret to more sales is understanding consumer behavior because consumer mood alters the weighting of product attribute information such that when consumer is in a good mood, positive product attributes are weighted more heavily.