Protonephridia are present in____________?
Correct answer: B. Flateworm
- A. Round worms
- B. Flateworm
- C. Tape worms
- D. Segmented worms
Explanation
Protonephridia are flame-cell excretory systems found in flatworms, including planarians and tapeworms. Students may choose roundworms because they also have a simple excretory system, but roundworms possess excretory canals or gland cells rather than protonephridia.
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