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B
Giraffe
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C
Crocodile
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D
Lion
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E
Blue whale
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Solution
The correct option is E Blue whale The heart is the major circulatory organ that contracts and relaxes to distribute the blood all through the body. The blue whale (Balaenoptera musculus) has the largest heart among all the animals. It weighs over 1,500 lb (680 kg). The heart pumps almost 7000 liters of blood/minute as compared to only 5 liters/ minute in humans.