Human hearts have pairs of two types of chambers; the atria (plural for atrium) and the ventricles. Atria are where blood enters the heart and ventricles pump the blood out of the heart. The heart also takes in oxygen poor blood, pumps it through the lungs or gills (fish), where the blood is oxygenated, and then pumped through the rest of the body. Identify which statement is correct.
A) Fish have a three-chamber heart.
B) Reptiles have a two-chamber heart.
C) Mammals have a four-chamber heart.
D) None of these statements are correct.
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