Which specialized excretory cells are characteristic of Phylum Platyhelminthes and function primarily in osmoregulation?
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Correct answer: Flame cells (Protonephridia)
Flame cells are the functional units of the protonephridial system in flatworms (Platyhelminthes). A tuft of cilia flickers like a flame, drawing interstitial fluid into the tubule system to regulate water and ion balance (osmoregulation).
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