Semi-open circulatory system

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Introducing a novel classification system, this book categorizes animals into four groups based on their circulatory systems: those lacking one, those with an open system, a newly defined semi-open system, and those with a closed system. The author argues that this framework uncovers the critical link between the strength of the circulatory system and the size of the animals, addressing a gap in previous scientific understanding. This fresh perspective aims to enhance the study of zoology and the evolutionary relationships among different species.