In which country is ethanol used as a fuel in vehicles?
- ADenmark
- BKenya
- CBrazil
- DChina
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Match the following concentrations of $DDT$ in an aquatic food chain:
Column-$I$ Column-$II$ $(a)$ Small fish $(1) \;25 \;ppm$ $(b)$ Zooplankton $(2) \;2 \;ppm$ $(c)$ Fish-eating birds $(3) \;0.5 \;ppm$ $(d)$ Large fishes $(4) \;0.04 \;ppm$
| Column-$I$ | Column-$II$ |
|---|---|
| $(a)$ Small fish | $(1) \;25 \;ppm$ |
| $(b)$ Zooplankton | $(2) \;2 \;ppm$ |
| $(c)$ Fish-eating birds | $(3) \;0.5 \;ppm$ |
| $(d)$ Large fishes | $(4) \;0.04 \;ppm$ |
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