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B
Excretory system
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C
Digestive system
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D
Cardiovascular system
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Solution
The correct option is D Cardiovascular system Circulatory system is also known as the cardiovascular system. Physical exercise improves the cardiovascular system because it increases the blood flow inside the blood vessels which helps in the rapid oxygenation of the cells and further increases the metabolic activity.
So, the correct answer is 'Cardiovascular system'.