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a major evolutionary change seen between fish circulatory systems and amphibian, bird and mammalian circulatory systems is the presence of a ________.
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a major evolutionary change seen between fish circulatory systems and amphibian, bird and mammalian circulatory systems is the presence of a ________.

User Donghui Zhang
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I think the answer is:
Double loop pathway in amphibians, birds and mammals.
User Kjayakum
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