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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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        | 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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