Which vertebrate class is characterized by a four-chambered heart without mixing of blood?
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Correct answer: Aves (birds)
Birds possess a fully divided four-chambered heart with complete separation of oxygenated and deoxygenated blood. This supports their high metabolic rate. While crocodilians also have four chambers, birds are the class most typically noted for this feature among the given options.
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More Modern Animal Classification questions
- Which classification approach uses molecular data such as DNA sequences?
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