Each ach nephridium of earthworm opens to the exterior by__________?
Correct answer: B. Nephridiopore
- A. Nephrostome
- B. Nephridiopore
- C. Flame cell
- D. Anus
Explanation
A nephridiopore is the external opening through which an earthworm's nephridium discharges excretory fluid. The likely mistake is nephrostome, which is the internal ciliated funnel that collects coelomic fluid rather than the external opening.
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