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

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Class 11 Biology Practice Test: Structural Organisations in Animals - Organs and Organ System — practice the complete quiz, review flashcards, or try a random question.


What is the function of the part labelled as a question mark in the given diagram?<br /><img src='https://www.fatskills.com/class11science/biology-aptitude-test-class-11-q8.jpg' alt='The Malpighian tubules performing excretion' width='400' height='600' />






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