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| Animal | Excretory organ/Unit |
| $(a)$ Balanoglossus | $(1)$ Metanephridia |
| $(b)$ Leech | $(2)$ Nephridia |
| $(c)$ Locust | $(3)$ Flame cells |
| $(d)$ Liver fluke | $(4)$ Absent |
| $(e)$ Sea urchin | $(5)$ Malpighian tubule |
| $(f)$ Pila | $(6)$ Proboscis gland |
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