Fish, Have gills and fins, Scales, Body cover in fish, Pollution, It causes a decrease in fish population, Vertebrates, Animals with backbone, Metamorphosis, The change in form and habits of an animal, Ectotherms, Organisms with body temperature affected by surrounding temperture, Amphibians, Have a 3 chambered heart and a moist skin, Shark, An example of a cartilaginous fish

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