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What structure does this organism use for respiration?    

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

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

Identify the structure in the red circle.     

Identify the structure. (blue arrow) 

Is this organism male or female?  How can you tell?

Identify structure I. 

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

Identify structure B 

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