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What structure does this organism use for respiration?    

What is the function of the green structure? (finger pointing) 

Identify the structure in the red circle.     

What type of circulatory system does this organism have?    

What is the function of D? 

What is the function of D? 

One side of the heart is less muscular than the other.  Which side is less muscular?  Why?  

Identify structure I. 

What is the function of structure A? 

Identify structure I.