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Glossary
Epidermis
The upper layer of your skin, above the dermis.
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Human Body - Glossary
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Cells
The tiny units which make up all the parts of your body.
Fertilization
The joining of a male sperm and a female egg to make a baby.
Mucus
A slimy substance which helps to protect the lining of your nose, ...
Ventricles
The two lower chambers of your heart.
