The more I learn about the human body..........

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fiat_money;2029681 said:
It's interesting how mammals and birds have the more complex hearts of vertebrates; while reptiles, amphibians, and fish--organisms that predate mammals and birds--have less complex hearts.

Almost as though the hearts found in vertebrates changed and became more developed over time.

Two chamber heart, three chamber heart, four chamber heart...This guy wins!
 
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