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