| A | B |
|---|
| sponges | water washing through pores then osculum |
| jellyfish, sea anemones, hydra, corals, flatworms | pumping water from surroundings in/out of gastrovascular cavity branching throughout body |
| mollusc (gastropod, bivalve) | open circulatory system w/ muscular tube heart & fluid filled coelom/visceral mass |
| cephalopod mollusc, annelids | closed circulatory system w/ simple tube hearts |
| arthropods | open circulatory system w/ hemolymph circulated through coelom (aka sinus) via tube heart |
| cartilage jawed fish, jawless fish, bony fish | closed circulatory system w/2 chamber heart allowing mixing of O2 rich & poor blood |
| amphibia | 3 chamber heart w/ partial mix O2 rich & poor blood |
| reptiles | 3 full chambers & partial ventical septum but still O2 rich/poor blood mixing |
| birds, mammals | 4 chamber heart allowing double circulation & full separation O2 rich & poor blood |
