The given line graph depicts inhabitant modification in three wildlife animals namely bears, dolphins and whales over a 5-year period starting from 2011.
The initial impression from the chart is that while the population of bears underwent an upward trend, the opposite was true for that of dolphins. It is also noticeable that the number dolphins was the highest in the first years before being surpassed by that og bears.
In 2011, 150 thousands (T) dolphins were recorded, which was the highest, followed by a dramatic drop to approximately 70T in 2012, continuing to see a decrease to roughly 25T, almost 6 times lower than the first figure. In contrast, the whale population was much higher than that of bears in 2011, exceeding about 75T compared to 0T. However, in the next 1 and 2 years, while the figure for the former kept on rising gradually to 50T and 100T, its conterpart witnessed a more significant increase, reaching the same level as that of whales in the same years ( about 50T and 100T, respectively).
From 2013 onwards, the graph diverged primarily. Bear population soared to hit the peak of just under 200T, meanwhile, an opposite trend was recored in that of dolphins, with almost emty, which resulted from polution, especially from untreated sewage, leading to extinction in a foreseeable future. Conversely, 2013 to 2016 experienced a fluctuation around 100T and 75T in that of whales.