Nia Donaldson

Biology

14 May, 02:17

The table below shows the salmon population, in thousands of pounds, in Columbia River, from 1870 to 1950.

Year Salmon population (in thousands of pounds)

1870 10,200

1890 20,000

1915 20,500

1931 30,000

1950 10,000

Based on the table, which of these is most likely the period during which a series of large hydropower units were built on the Columbia River?

A. between 1870 and 1890

B. between 1890 and 1915

C. between 1915 and 1931

D. between 1931 and 1950