Ronatalawrence5671 Ronatalawrence5671

15-03-2024
Biology

contestada

The biological oxygen demand (BOD) of unpolluted river water is ____________.
a) 10 - 20 mg O₂/dm³/5 days
b) 5-10 mg O₂/dm³/5 days
c) less than 5 mg O₂/dm³/5 days
d) more than 20 mg O₂/dm³/5 days

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