Birds, reptiles, and dinosaurs belong to the same taxon, while mammals do not. Reptiles and dinosaurs have three-chambered hearts, while birds and mammals have four-chambered hearts. Which features are analogous?

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Birds, reptiles, and dinosaurs belong to the same taxon, while mammals do not. Reptiles and dinosaurs have three-chambered hearts, while birds and mammals have four-chambered hearts. Which features are analogous?