Thank you for your feedback. Sea squirts have two large pores, one to guide water into the body cavity the oral, or branchial, aperture , the other serving as an exit the atrial, or cloacal, aperture. In some ascidians sea squirts , however, vanadium replaces iron. Although all adults are simultaneous hermaphrodites possessing both male and female functional reproductive organs , eggs shed into the water are fertilized by sperm from other individuals. The body has an outer protective covering, the tunic, which contains a cellulose -like substance. Sea squirts are primarily sessile permanently fixed to a surface , potato-shaped organisms found in all seas, from the intertidal zone to the greatest depths.
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