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| a substance that gives skin its color |
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| a part of the body that makes substances the body needs |
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Definition
| the layer of skin just below the epidermis |
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| a tiny opening in the skin |
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| a tiny particle that can reproduce only inside a living cell |
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| cells in the blood that fight bacteria and viruses |
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| a chemical made by the immune system to fight a particular disease |
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| the body's ability to fight diseases caused by germs |
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| a medicine that causes the body to form antibodies against a certain disease |
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