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Tarpon have caudal, dorsal, and anal fins that help it move efficiently through the water. The Tarpon also has an extended jaw unlike most species in this taxonomic group. Internally the Tarpon is like most except is has very large gills and a swim bladder. It is territorial and very aggressive towards its prey. They are found in the Atlantic ocean, but can also be found in fresh water.  Has an aquatic habitat and does not live in one specific spot.

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Catfish have dorsal, caudal, pectoral, and adipose fins. Also, they have barbels which allow them sense their surroundings. Catfish are very sensitive to taste and smell. They can be found in inland or coastal water in North America, South America, Antarctica, Europe, and Asia.

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Piranha's have caudal, dorsal, and pectoral fins. They also have nasal flaps to allow them to smell. Internally piranha's have common characteristics like most fish, except they have a pelvic serrae. Piranha's are generally non aggressive, but become very aggressive when they are protecting their young and or hunting for prey. Piranha's are found in the fresh waters of South America.

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Kingdom- Animalia
Phylum- Chordata
Class- Actinopytergii
Order- Elopidformes
Family- Meglapidae
Genus- Megalops
Species- Megalops Cyprinoides

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Kingdom- Animalia
Phylum- Chordata
Class- Ray-finned fishes
Order- Silurformes
Family- Air Breathing fish
Genus- Clarias
Species- Clarias Albopunctatus

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Kingdom- Animalia
Phylum- Chordata
Class- Actinopytergii
Order- Chrariformes
Family- Charicide
Genus- Piranha
Species- Serrasminae

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Taxonomy can show relatedness because all three of the exemplary organisms had the same kingdom. This mean that they all came from a common ancestor, which shows relatedness.

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The RNA in piranha's have a binding protein that is called RBP. RBP's help the RNA bind and it also helps with the sequence of the RNA. The tarpon has a very similar RNA sequences. This shows how they come from a common ancestor, therefore relatedness.

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Piranha's have 54 chromosomes or 2n. In its DNA there were C banding patterns found that are shown by the centromeric regions. Catfish on the other hand have 29 chromosomes. It is assumed that Catfish have undergone teleost specific genome duplication. Tarpon have 52 chromosomes or 2n. The karyotype formula is 52a. The number of chromosomes are all different, but the genes are structured very similarly.

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Catfish and Piranha's were shown to have about the same size eggs in their early development stages. Also, they both have yolk sacs. These similarities help to show that they both came from a common ancestor and are related to one another.

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The evolution of bony fish is punctuated equilibrium because the evolution of bony fish has been rapid and quick but then began to slow down. It started back 530 million years ago in the Cambrian era when there was an explosion of new species of fish.

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The type of evolution in bony fish is divergent evolution because these species have evolved to be similar to each other

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Catfish originally had white and grey tails but some now have red tails due to emigration and immigration. They were immigrated to South America and developed different colored tail because of this.

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Non-Random mating is displayed through catfish and piranha's. Catfish and Piranha both choose who they mate with. They mate based on their behavior and appearance

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Decent with modification is shown when Piranha's pass down their red bellies to their offsping. Another example of this is when Tarpon pass down their extended jaw-line down to their offspring.

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Natural selection can be shown in the catfish because the catfish have grey and red tails, and the ones with red tails were able to ward of predators with their red tails which allowed them to survive better than the other catfish.