1. Right auricle, Left ventricle, Left auricle, Aorta.
2. Superior vena cava, Inferior vena cava, Pulmonary artery, Aorta.
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Solution
In both cases aorta is odd 1) All others are chambers of heart but aorta is an artery.
2) Aorta is odd because all other carry deoxygenated blood except the aorta.