Portuguese Man Of War is a complex colonial siphonophore, otherwise known as a jellyfish. Its air bladder keeping it afloat and acting as a sail while the rest of the organism hangs below the surface. It has no means of self-propulsion and is entirely dependent on winds, currents, and tides. It is most common in the tropical and subtropical regions of the Pacific and Indian oceans, but can drift outside of this range on warm currents such as the Atlantic Gulf Stream.
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Cnidarians have no formal respiratory system, but the body and tentacles of a jellyfish consist of only two cell layers, the endoderm and the ectoderm. Between the two cell layers is the mesoglea, which forms the bulk of the animal. The body is basically a single sac-like space which communicates with the surrounding water through the mouth. Thus all the cells of the jellyfish are directly in contact with the surrounding seawater, and have direct exchange of oxygen, carbon-dioxide, and wastes.