According to the DENR, as many as 50 of the 421 rivers in the country are already considered “biologically dead.” Biologically dead rivers no longer contain any oxygen and cannot support any but the hardiest kinds of species.
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According to the DENR, as many as 50 of the 421 rivers in the country are already considered “biologically dead.” Biologically dead rivers no longer contain any oxygen and cannot support any but the hardiest kinds of species.