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