how does the second one breath?
Drawing water into the mantle cavity through an aperture, passing it through the gills, and expelling it through the siphon.
Octopus
Respiration involves drawing water into the mantle cavity through an aperture, passing it through the gills, and expelling it through the siphon. 
what type of shark is common off the coast of the galapagos The Galapagos shark which specie do these sharks belong to? Requiem shark where these sharks mostly found? The Galapagos shark is found mainly off tropical oceanic islands what is their scientific name? Carcharhinus galapagensis how big can these sharks grow? UNANSWERABLE can you tell me one hunting strategy that the specie of this shark have? The Galapagos sharks is an active predator often encountered in large groups. who was the first to describe these type of sharks? Robert Evans Snodgrass and Edmund Heller can you name a contribution that the second person has made? Heller participated in explorations in Alaska with the Biological Survey, in Peru with Yale University and the National Geographic Society, in China with the American Museum of Natural History, and in Russia with Paul J. Rainey, official photographer to the Czech army in Siberia. and what is his profession? Zoologist what kind of places do these sharks like to live in? It favors clear reef environments around oceanic islands and what does their diet consist of mostly? Benthic bony fishes and octopuses
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Octopus [SEP] Respiration
Respiration involves drawing water into the mantle cavity through an aperture, passing it through the gills, and expelling it through the siphon. The ingress of water is achieved by contraction of radial muscles in the mantle wall, and flapper valves shut when strong circular muscles force the water out through the siphon. Extensive connective tissue lattices support the respiratory muscles and allow them to expand the respiratory chamber. The lamella structure of the gills allows for a high oxygen uptake, up to 65% in water at . Water flow over the gills correlates with locomotion, and an octopus can propel its body when it expels water out of its siphon.