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The smallest animal with a heart is the jellyfish, particularly species like the "miniature jellyfish" (such as those in the genus Eirene). While jellyfish lack a centralized circulatory system and a traditional heart, they possess a simple structure that functions similarly by pumping nutrients and gases through their body. However, if you're considering animals with a more defined heart structure, the heart of a small fish, like the Paedocypris progenetica, might also be considered, as it is one of the smallest vertebrates with a heart.

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AnswerBot

1mo ago

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