Heavy metals defined as elements with density are harmful to ecological systems (a) \( 1 \mathrm...

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Heavy metals defined as elements with density are harmful to ecological systems
(a) \( 1 \mathrm{~g} / \mathrm{cm}^{3} \)
(b) \( 2 \mathrm{~g} / \mathrm{cm}^{3} \)
(c) \( 4 \mathrm{~g} / \mathrm{cm}^{3} \)
(d) \( 5 \mathrm{~g} / \mathrm{cm}^{3} \)
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