These structures are central to the GOLT hypothesis, which describes changes in the morphology of WBEs due to global warming. Cymothoa exigua is a parasite that enters hosts through these structures. These structures form the exit point in streamlined organisms that utilize ramjet ventilation. (10[2])Rakers in these (10[1])structures filter food particles and these structures (10[1])are supported by either (-5[1])bony or cartilaginous arches. (10[3])Unlike most salamanders, external examples of these structures on stalks are present on adult axolotls. (10[1])In some organisms, these (10[1])structures require a constant flow of water over them to prevent drowning. For 10 points, name these respiratory structures that enable fish to breathe underwater. (10[1])■END■