One reason that polar climates support a higher biomass is that colder water can hold more dissolved oxygen than warmer water.

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This statement is true. Cold water has the ability to hold more dissolved oxygen than warm water. This is because the solubility of oxygen decreases as water temperature increases. Therefore, in polar climates, where water temperatures tend to be colder, the water contains a higher concentration of dissolved oxygen, which supports a higher biomass of organisms that depend on oxygen for survival.

One Reason That Polar Climates Support a Higher Biomass Is