Fish - Wikipedia, the free encyclopedia
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A fish is any aquatic vertebrate animal that is typically ectothermic (or cold-blooded), covered with scales, and equipped with two sets of paired fins and several unpaired fins. Fish are abundant i...
en.wikipedia.org/wiki/Fish
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Gnathostomata - Wikipedia, the free encyclopedia
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Gnathostomata (pronounced /ˌneɪθɵstoʊˈmɑːtə/ ) is the group of vertebrates with jaws. The term derives from Greek γνάθος ( gnathos ) "jaw" + στόμα ( stoma ) "mouth". The group is tradit...
en.wikipedia.org/wiki/Gnathostomata
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From these bottom feeding, jawless fish came the evolution of jawed fish. Jaws evolved only once (rather than evolving multiple times in different species through parallel evolution). Jaws evolved from gill arches which are the bony parts between gill slits.
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serendip.brynmawr.edu/exchange/node/1904
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Kinds of fish included: jawless fish, jawed fish (which made there debut in the Silurian period), early sharks, and bony fish. From Bony fish, early amphibians began to form...
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library.thinkquest.org/20886/fish.htm
library.thinkquest.org/20886/fish.htm
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In a sense, placoderms represent an "early experiment" in the evolution of jawed fish; they radiated into a number of body shapes and ecological niches, which were occupied by other fish lineages after the extinction of the placoderms.
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www.ucmp.berkeley.edu/vertebrates/basalfish/placodermi....
www.ucmp.berkeley.edu/vertebrates/basalfish/placodermi.html
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Simple explanation of jawless fish in the framework of the history of the Universe ... Fish without jaws were the first vertebrates. Just like the molluscs and arthropods, the early fish had a hard outer covering. This armor plating around their front ends was made of bone. Perhaps it was a defense against sea scorpions.
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www.historyoftheuniverse.com/jawlfish.html
www.historyoftheuniverse.com/jawlfish.html
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The first jawed fish appeared 430 million years ago. The two earliest classes are extinct, but they were succeeded by the cartilaginous and bony fish which survive to the present. ... There are no fossils intermediate between jawless and jawed fish, but evidence from comparative anatomy and embryology supports the theory of...
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www.mhhe.com/biosci/esp/2001_gbio/folder_structure/di/m...
www.mhhe.com/biosci/esp/2001_gbio/folder_structure/di/m8/s2/dim8s2_3.htm
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When a bony fish or a tetrapod loses a tooth, a new one grows from the bone below the void, whereas other jawed vertebrates, such as sharks, have teeth that grow from inside their gums. Sharks have skeletons of cartilage instead of bone.
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news.nationalgeographic.com/news/2007/08/070801-jawed-f...
news.nationalgeographic.com/news/2007/08/070801-jawed-fish.html
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A northern native band that displayed a deformed, two-jawed fish at a weekend water conference says ... "What happens to the wildlife and the fish is eventually what is going to happen to us," Poitras said Tuesday, adding that people have expressed "disbelief" upon seeing the fish.
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www.canada.com/calgaryherald/news/story.html?id=3046010...
www.canada.com/calgaryherald/news/story.html?id=3046010a-b55a-4935-b014-56711811aeab
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