Which phylum exhibits true metameric segmentation, a closed circulatory system with hemoglobin dissolved in plasma, and nephridia?
Answer and explanation
Correct answer: C. Annelida
- Step 1: Annelids (such as the earthworm Pheretima and leech Hirudinaria) have bodies divided externally and internally into serial metameres. Step 2. They possess a true coelom, closed blood circulation with plasma-dissolved hemoglobin, and segmentally arranged metanephridia. Answer: Annelida (Segmented worms). Why not the others: Arthropoda has open circulation; Nematoda lacks segmentation; Mollusca is unsegmented with an open system (except cephalopods).
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