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Bony Fish can be organized by their skeleton, hinged jaw, and the different types of Gills. They also have different ways of pumping in water into their system creating an operculum. The Bony Fish also have different swim bladders to help them function. The fish also have different external scales called cycloid differing them from other species of fish.  The different kinds of Bony Fish also lay and fertilize their eggs externally.

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Kingdom | Animalia | animals
Phylum | Chordata | with spinal cords
Subphylum | Vertebrata | with back bones
Superclass | Gnathostoma | jawed vertebrates
Grade | Osteichthes | bony fishes
Class | Actinopterygii | ray-finned fishes
Division | Teleostei | completed bones
Subdivision | Ostarioclupeiomorpha | bone-shield-form
Superorder | Ostariophysi | bone-bladder
Series | Otophysi | ear-bladder
Order | Siluriformes | catfishes

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Kingdom: | Animalia
Phylum: | Chordata
Class: | Actinopterygii
Order: | Salmoniformes
Family: | Salmonidae
Genus: | Salmo
Species: | S. salar

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Kingdom: | Animalia
Phylum: | Chordata
Class: | Sarcopterygii
Clade: | Dipnomorpha
Subclass: | Dipnoi
J. P. Müller, 1844
Orders

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Many of the fish have the same proteins and that means an shows how closely related the fish are to each other.

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Fish have always been closely related to humans for the past billion years. They sometimes can tell time,  have a vivid memory of events that occurred a while ago, and they also have Mohawks.

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Age of Fossil is around 45 million years old

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Age of Fossil is 65 million years old

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Age of Fossil: 50 million years old

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Age of Fossil: 65 million years old

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Age is 56 million years old

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Age of Fossil 65 million year to 55 million years old.

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Many similarities between the Catfish, Salmon, and Lungfish are usually most common internally. Most of the differences like mouth and head position tend to be more different as the species of Bony Fish varies. The nose of the Bony Fish does not connect to any part of the mouth or gills. The size of mouth or gills can usually help to indicate whether the fish has good eating habits.

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Many of the Bony Fish species show little to no evolution at times due to the lack of variety. They have stayed the same for a long time and continue to gradually increase in evolution.

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The Fish usually reproduce seasonally or whenever they feel safe in their environment. The reproduction process usually lasts about 4 months or can last longer depending on the environment and species.

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When Fish began to become and live in the waters on Earth they often split up and this created a divergent change in the way they acted in the environment. Other Fish began to form from these different groups of Fish split up and soon enough the Fish began to share some of the characteristics and which created a diverse community of Fish.

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Fish were always being split up due to various factors. Once the fish start to live in these isolated areas they have to mate and reproduce to survive. The baby fish will then have the same genes that the father and mother had creating a more variety of fish.

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As Darwin stated earlier natural selection plays a big role in the survival of the fittest. The external features and other internal features are among other organisms and can also influence the better traits suited with the better environment. This theory can best be described in Bony Fish because as time goes on the species can better adapt and fit in to their environments. Even more and more fish have began to develop different adaptations including protection to better themselves in the future. As the species last longer they also gain more knowledge and characteristics as time continues on.

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https://www.ncbi.nlm.nih.gov/pubmed/8873347
http://study.com/academy/lesson/bony-fish-characteristics-anatomy-types.html
https://www.peta.org/features/ways-fish-just-like/
http://blogs.plos.org/paleocomm/2017/03/08/the-now-older-age-of-fishes-new-bony-fish-from-the-silurian-of-china/
https://seaworld.org/en/animal-info/animal-infobooks/bony-fish/physical-characteristics/