A protagonist is the main character in a play, novel, or real event such as a battle or struggle.
Something or someone that is protean is adaptable, variable, or changeable in nature.
Protocol is the rules of conduct or proper behavior that a social situation demands.
any of a large group of nitrogenous organic compounds that are essential constituents of living cells
a stable particle with positive charge equal to the negative charge of an electron
a standard or typical example
in some classifications considered a superphylum or a subkingdom
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