Test Academy | The graph plotted below is based on the data collected by biology students with respect to the levels of oxygen at the specific points in the river flowing outside their city. Which point in the graph indicates the entry of untreated sewage in the river ? Point (i), Point (ii), Point (iii), Point (iv)

Question

The graph plotted below is based on the data collected by biology students with respect to the levels of oxygen at the specific points in the river flowing outside their city. Which point in the graph indicates the entry of untreated sewage in the river ?

Options :

Point (i)
Point (ii)
Point (iii)
Point (iv)

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