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Which of the following processes allows for the movement of molecules from an area of higher concentration to an area of lower concentration?

 
 
 
 

Which of the following is NOT a function of the circulatory system?

 
 
 
 

Which of the following is NOT a function of the skeletal system?

 
 
 
 

Which of the following is a type of symbiotic relationship in which one organism benefits while the other is harmed?

 
 
 
 

Which of the following is a function of the respiratory system?

 
 
 
 

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