Glossary

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an injection of a weakened or dead pathogen into the body to build up immunity against a disease...

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an antigen preparation that stimulates the immune system to give protection against a particular...

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a sac-like structure in plant cells that contains the cell sap. It supports the cell and helps...

the electrons in the outermost occupied shell of an atom.

the energy level, or shell, of an atom that contains the valence electrons.

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