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Carotenoid, any of a group of non nitrogenous yellow, orange, or red pigments (bio chromes) that are almost universally distributed in living things. There are two major types: the hydrocarbon class, or carotene, and the oxygenated (alcoholic) class, or xanthophylls. Synthesized by bacteria, fungi, lower algae, and green plants, carotenoids are most conspicuous in the petals, pollen, and fruit (ex: carrots, sweet potatoes, tomatoes, and citrus fruits) of the flowering plants.
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The outer core is the third layer of the Earth. It is the only liquid layer, and is mainly made up of the metals iron and nickel, as well as small amounts of other substances. ... These powerful currents cause lines of invisible force to stretch around the Earth and thousands of miles into space, creating a magnetic field.
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