Within the ocean, temperature gradients occur in the water column. Which best describes how temperature variations affect the nutrient levels at the surface?
A) Nutrients are decreased near the surface because upwellings force nutrient-rich water towards the warmer bottom and nutrient-poor water to the colder surface.
B) There are always many more nutrients at the warmer surface than in the colder deeper water.
C) The nutrient level at the surface is not affected by temperature variations.
D) Nutrient levels at the surface increase because upwellings force nutrient-rich water from the colder bottom to the warmer surface.
Ans: D) Nutrient levels at the surface increase because upwellings force nutrient-rich water from the colder bottom to the warmer surface.
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