Question

If other factors are equal, which of the following environments would have the highest level of dissolved oxygen?

Question 5 options:

	A) warm, salty water at low elevation
	B) cool, salty water at low elevation
	C) warm freshwater at high elevation
	D) cool freshwater at high elevation
	E) cool freshwater at low elevation

Answer 1

I believe the correct answer to be as follows;

Option E) cool freshwater at low elevation.

because Cold water can dissolve more oxygen than warm water. As the temperature goes up, water releases some of its oxygen into the air. Water also holds less dissolved oxygen at higher elevations because there is less pressure. Solubility of dissolved oxygen also decreases as salinity increases.

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