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A thermocline (also known as the thermal layer or the metalimnion in lakes) is a thin but distinct layer in a large body of fluid (e.g. water, such as an ocean or lake, or air, such as an atmosphere) in which temperature changes more rapidly with depth than it does in the layers above or below.
Choline is an essential nutrient that is part of cell membranes and contributes to their strength. The recommended dietary allowance, or RDA, is 425 milligrams for adult females and 550 milligrams for adult males.