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| स्तंभ-$I$ | स्तंभ-$II$ |
|---|---|
| $(a)$ छोटी मछली | $(1) \;25 \;ppm$ |
| $(b)$ प्राणिप्लवक (Zooplankton) | $(2) \;2 \;ppm$ |
| $(c)$ मछली खाने वाले पक्षी | $(3) \;0.5 \;ppm$ |
| $(d)$ बड़ी मछलियाँ | $(4) \;0.04 \;ppm$ |
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