chidoblasts or nephridia
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Explanation:
Cnidoblasts- The body wall of Coelenterata consists of two distinct layers of cells: epidermis and gastrodermis which has many cells- cnidoblasts, interstitial cells, epitheliomuscular cells.
Nephridia- In annelids, the excretory system consists of coiled tubules, the metanephridia.
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