"<span>A. The polar regions have long winters and short, cool summers." would be the correct answer.
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In order to use the energy stored in fat, the body breaks dow triglycerides into fatty acids, which individual cells burn for energy
 
        
             
        
        
        
The answer to your question is winter
        
                    
             
        
        
        
Physical changes are changes affecting the form of a chemical substance, but not it`s chemical composition. 
A physical change, changes the following:
-appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others. 
Answer:
C. density(the degree of compactness of a substance)