Assuming that all other factors are equal, on a cold winter afternoon the amount of dissolved O₂ in a lake will be

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Cold water can hold more dissolved oxygen than warm water. This is because as temperature increases, the solubility of gases decreases. Therefore, on a cold winter afternoon, the amount of dissolved oxygen will be more than on a hot day because the decreased energy in colder water makes O₂ molecules less likely to escape to the atmosphere. Biological oxygen demand will be lower on a cold day because the metabolic rate of aquatic organisms decreases as temperature decreases, leading to a decreased demand for oxygen.

Assuming That All Other Factors Are Equal, on a Cold