Which one of the following is a wrong statement? \( \mathrm{P} \) W...

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Which one of the following is a wrong statement?
\( \mathrm{P} \)
W
(1) Greenhouse effect is a natural phenomenon
(2) Eutrophication is a natural phenomenon in freshwater bodies
(3) Most of the forests have been lost in tropical areas
(4) Ozone in upper part of atmosphere is harmful to animals
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