What made the Rhine river one of Europe's most polluted rivers
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There are 10 parts of a heart:
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Right Atrium
Right Ventricle
Left Ventricle
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Aorta
Superior Vena Cava
Pulmonary Arteries
Left Atrium
Right Atrium
Right Ventricle
Left Ventricle
Right Coronary Vein
Right Coronary Artery
Apex