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the amount of satisfaction that consumers get from consuming (using) a good or service.
a v-shaped extension of the mammalian soft palate, which closes the opening to the nasal...
an injection of a weakened or dead pathogen into the body to build up immunity against a disease...
an antigen preparation that stimulates the immune system to give protection against a particular...
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.
a number that indicates how the atom will react during the formation of chemical bonds.
a measure of the number of bonds formed by an atom of a given element.