Flame cells in Planaria constitute the:
Correct answer: D. Excretory system
- A. Digestive system
- B. Reproductive system
- C. Respiratory system
- D. Excretory system
Explanation
Flame cells function like the kidney, removing waste materials throug filteration. The cilia propel waste matter down the tubules and out of the body through excretory pores that open on the body surface; cilia also draw water from the interstitial fluid, allowing for filteration.
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