No it couldn't happen as cellular respiration brake down glucose by the help of O2 to form ATP and co2 while this Glucose was first synthesized by the photosynthesis process without it there wouldn't have been any glucose for cellular respiration to take place
A shark's cardiovascular system flows in one loop, called the double circulatory system. Where as with mammals it is more like a tree, veins branching out from the heart and off other blood vessels.
I would say cow
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it is the farthest down
if not whale, because it is the only non-land animal there
