countryboy21 countryboy21

16-12-2016
Biology

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which organism does not have a double loop circulatory system A) bird B)fish C) human D) dog

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liliraine liliraine

16-12-2016

Well double loop circulatory systems are present in mammals and bird if I remember correctly, since fish is the only animal that is that a mammal or a bird that would be the answer, B.

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