For the cell notation shown, [tex]Ag(s)[/tex] is the species that is undergoing reduction.
What is reduction?
Reduction can be defined as a chemical reaction or phenomenon through which the number of electrons or oxidation states associated with the atoms of a chemical element are changed.
This ultimately implies that, reduction is a half-reaction that typically involves decreasing the oxidation number of a chemical species, especially by gaining electrons.
In this scenario, [tex]Ag(s)[/tex] is the species that is undergoing reduction because it is not oxidized and it gains one (1) electron.
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