The period of revolution of an object in the Solar System is the time it takes an object to travel around the Sun.
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Bioluminescence occurs through a chemical reaction that produces light energy within an organism's body. For a reaction to occur, a species must contain luciferin, a molecule that, when it reacts with oxygen, produces light. ... Many organisms also produce the catalyst luciferase, which helps to speed up the reaction
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Toxic sediment and nutrient that's the answer
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