Fish

fish are limbless cold-blooded vertebrate animals with gills and fins and living wholly in water. Some have gills like portholes and live as parasites. Others are sharks,carnivorous cartilaginous fish with big teeth that move forward to replace those that fall out. These creatures have streamlined bodies that help them move. The more streamlined the body,the faster the fish. Fish have special kidneys full of oil that help them float.