What species can act as either an acid or a base depending on the other reactants

There are certain species that can act as either an acid or a base depending on the other reactants, these are called amphoteric species.

An amphoteric species can either accept or donate protons, depending on the context of the reaction. They can act as an acid in the presence of a strong base and as a base in the presence of a strong acid. For example, water is considered an amphoteric species because it can accept a proton, becoming H3O+ (acidic) or donate a proton, becoming OH- (basic). Other examples of amphoteric species include amino acids, aluminum hydroxide, zinc oxide, and hydrogen carbonate ions.