Fish Hearts Have "Four" Chambers

Fish hearts have "four" chambers.The greatest advantage of the fish's heart is

A) its ability to pump blood to all areas of the fish's body.
B) its ability to pump blood to the gills before the blood is pumped to the remaining areas of the body.
C) its ability to stay full of blood even as it is emptying into the conus arteriosus.
D) its ability to function inside of a fish that lives under the water,especially at great depths.
E) its ability to maintain a constant blood pressure in the fish.

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