Use your version. These two versions differ by only two words (that, was).<br /><br />
<p>Similarly, the dissolution of CuO NPs was shown to be the most critical parameter of assessing toxicity in estuarine and marine environments though different types of CuO NPs exhibited the extent of toxicity as the most toxicity observed from the synthesized nano-CuO (e.g., 12 times lower concentration estimated in EC<sub>50</sub>) compared to less-pure commercial nano-CuO [Torres-Duarte et al., 2015].</p>
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<p>Similarly, the dissolution of CuO NPs was shown to be the most critical parameter of assessing toxicity in estuarine and marine environments though different types of CuO NPs <strong>that</strong> exhibited the extent of toxicity as the most toxicity observed from the synthesized nano-CuO (e.g., 12 times lower concentration estimated in EC<sub>50</sub>) <strong>was</strong> compared to less-pure commercial nano-CuO [Torres-Duarte et al., 2015].&nbsp;</p>