It is a synecdoche in which a pulse and a breath are small parts that represent all of life is the figurative meaning line "Pulse for pulse, breath for breath."
Synecdoche is a type of metonymy and a rhetorical device that uses a phrase to signify one thing to allude to a different, related object. Synecdoche is different from metaphor, despite the fact that in the past it was thought of as a subspecies of metaphor, with the intention of using metaphor as a form of mental replacement.
Microcosm and macrocosm are the two basic categories of synecdoche. In a microcosm, a portion of anything is used to represent the complete thing. In contrast, the macrocosm refers to a little portion of something by the name of its complete structure.
Hence the correct option is 3
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