Which phylum of the animal kingdom contains multicellular organisms with cellular level of organization and choanocyte collar cells?
Answer and explanation
Correct answer: B. Porifera
- Step 1: Sponges are primitive metazoans lacking true tissues and organs. Step 2. They possess a water canal system lined with flagellated choanocyte collar cells that generate water currents to capture food particles. Answer: Porifera (Sponges). Why not the others: Cnidaria possesses tissue grade with cnidocytes; Platyhelminthes exhibits organ-system grade with flame cells; Annelida has metameric segmentation.
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