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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The major evolutionary change seen between fish circulatory systems and amphibian, bird, and mammalian circulatory systems is the presence of a double loop pathway in amphibians, birds, and mammals. This means that these animals have two distinct circuits: one for oxygenated blood and one for deoxygenated blood. Fish, on the other hand, have a single circuit that takes blood to the gills and then distributes the oxygenated blood throughout the body. This double loop pathway allows for more efficient exchanges of gases and nutrients throughout the body.

A Major Evolutionary Change Seen Between Fish Circulatory Systems and Amphibian,bird,and