Do you think a coelacanth is more closely related to a bull shark or a moray eel? Explain your reasoning. Gills: Allow a fish to breathe. Some fishes have gills covered by flaps. When a fish opens ...

They observed that more than half the eels, after being eaten by the dark sleepers, would miraculously “reappear”—by escaping through the predator’s gills. To further examine the eels ...

Berlin’s bloodworm eels are considered “a true dwarf species,” reaching just under 7 inches in length, the study said. They have “extremely slender,” “worm-like” bodies with gills bu ...