Which of the following excretory structures is characteristic of flatworms such as *Planaria*?
- Flame cellsAnswer
- BNephridia
- CMalpighian tubules
- DContractile vacuoles
Answer
Flame cells are the characteristic excretory structures found in flatworms (Platyhelminthes).
Flame cells are cilia-bearing cells involved in excretion and osmoregulation specifically in flatworms like *Planaria*.
Step-by-Step Solution
Key Concept
Excretory structures in invertebrate phyla