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| Description: In crocodilians, birds, and mammals, the heart has four chambers: two atria and two ventricles. Oxygenated blood and oxygen-poor blood do not mix. Picture Stats: Views: 105 Filesize: 203.04kB Height: 1375 Width: 1500 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47550 |