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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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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