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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. 

Identify structure B 

What is the function of structure A? 

Give one example of where this tissue can be found in the human body. 

What structure does this organism use for excretion?