The average change of dissolved oxygen per year in the lake over the course of the study is; 0.11 mg/L
Dissolved oxygen is defined as the amount of oxygen gas that is present dissolved in a given volume of water as a solution.
Dissolved oxygen is very important for aquatic animals as it provides the main source of oxygen required for respiration by these animals.
Due to human activities arising from water pollution and heating of water bodies, the amount of dissolved oxygen in water bodies is on the decrease.
To calculate the average change of dissolved oxygen per year in a particular lake, the formula is;
Average change of dissolved oxygen per year = total change over the years/total number of year
Average change of dissolved oxygen per year = (8.6 mg/L - 3.3 mg/L)/(2014 - 1965) = 0.11 mg/L
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