Sure! Here are the simplest meanings for the words you provided:
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Circulatory system: The system in the body that moves blood and nutrients around.
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Metabolic: Related to the processes that convert food into energy in the body.
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Phytochemicals: Natural compounds found in plants that can have health benefits.
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Food additives: Substances added to food to enhance flavor, appearance, or preservation.
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Contaminants: Unwanted substances that can make food or other items unsafe or dirty.