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10. High biological oxygen demand in a water body means ________ a. Water is not polluted b. Water is polluted c. Waterbody contains lots of lifeforms d. None of the above

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10. High biological oxygen demand in a water body means ________
a. Water is not polluted
b. Water is polluted
c. Waterbody contains lots of lifeforms
d. None of the above
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Ans: Water is polluted
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