MCQ
When huge amount of sewage is dumped into a river, its $\text{BOD}$ will:
- ✓Increase.
- BDecrease.
- CSharply decrease.
- DRemain unchanged.
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$(a)$ Darwin's Finches of Galapagos islands.
$(b)$ Herbicide resistant weeds.
$(c)$ Drug resistant eukaryotes.
$(d)$ Man$-$created breeds of domesticated animals like dogs.