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What is the function of the part labelled as a question mark in the given diagram?

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MCQs on animal tissues, animals organs and organ system, earthworm, cockroach and frogs.


What is the function of the part labelled as a question mark in the given diagram?<br><img src='https://www.fatskills.com/images2/biology-aptitude-test-class-11-q8.jpgalt='Excretion of cockroach diagram' width='447' height='643' class='302959' />"






 
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