47A reversal of the burden of proof would have meant that, in the absence of proof concerning the bioaccumulation of a substance, the appellants were required to demonstrate the absence of bioaccumulation, which was not the case in this instance. By contrast, as the Advocate General observes in point 91 of her Opinion, the party which is claiming an inadequate investigation of the relevant factors or manifest errors of assessment must first adduce factors justifying the doubts, which are relevant to the decision, regarding the plausibility of the assessment made by the EU authority in question, with it being for the latter, if necessary, to rebut that plausibility; this does not constitute a reversal of the burden of proof.
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