Question

how does water temperature affect dissolved oxygen levels? higher temperatures decrease dissolved oxygen. higher temperatures causes oxygen to solidify. temperature has no effect on dissolved oxygen. higher temperature causes oxygen to liquefy.

Explanation:

To determine the correct answer, we analyze each option:

• Option 1: Higher temperatures decrease dissolved oxygen. This is consistent with the principle that as water temperature rises, the solubility of gases (like oxygen) in water decreases because the kinetic energy of water molecules increases, making it harder for gas molecules to stay dissolved.
• Option 2: Oxygen solidifies at extremely low temperatures (well below water's freezing point), and higher temperatures do not cause oxygen to solidify. So this is incorrect.
• Option 3: Temperature does affect dissolved oxygen levels (as explained for Option 1), so this is incorrect.
• Option 4: Oxygen is already a gas (or dissolved in water), and higher temperatures do not cause it to liquefy (liquefaction of oxygen requires low temperatures and high pressure, not high temperatures). So this is incorrect.

Answer:

Higher temperatures decrease dissolved oxygen.